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VERSION:2.0
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BEGIN:VEVENT
SUMMARY:Probing Leptogenesis using Gravitational Waves
DTSTART;VALUE=DATE-TIME:20210923T074500Z
DTEND;VALUE=DATE-TIME:20210923T080000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110102@indico.desy.de
DESCRIPTION:Speakers: Julia Harz (Technical University of Munich (TUM))\,
Florian Heger\, Kåre Fridell (Technical University of Munich)\, Chandan H
ati (Technische Universität München\, James-Franck-Straße 1\, D-85748 G
arching\, Germany)\nBreaking of a $U(1)_{B-L}$ local symmetry\, a feature
that occurs in a wide variety of the Standard Model ultraviolet completion
s\, can lead to generation of cosmic strings which can lead to an observab
le signal in gravitational waves (GWs). In this talk we will discuss how t
he GWs can be used to probe leptogenesis mechanism due to heavy neutrino d
ecay. In particular\, we will look into the impact of the cosmic string de
cay and the presence of a scalar field\, that breaks the $U(1)_{B-L}$ symm
etry and can decay into heavy neutrinos\, on the thermal leptogenesis para
meter space in the context of a potential positive GW signal at the upcomi
ng experiments.\nhttps://indico.desy.de/event/26540/contributions/110102/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110102/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fuzzy Dark Matter Candidates from Strings
DTSTART;VALUE=DATE-TIME:20210923T095500Z
DTEND;VALUE=DATE-TIME:20210923T101000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110078@indico.desy.de
DESCRIPTION:Speakers: Nicole Righi (DESY)\nWe provide a string theoretical
explanation of fuzzy dark matter as composed by ultra-light axions coming
from the compactification of type IIB string theory on Calabi-yau manifol
ds. In particular\, we consider C_4 axions stabilased in a Large Volume Sc
enario\, and thraxions\, axionic modes living in warped throats of the int
ernal manifold. Based on the latest bounds\, we study how likely is for da
rk matter to be composed of such particles and in which abundance. We prov
ide predictions on the preferred ranges of masses and decay constants when
string axions behave as FDM. Moreover\, requiring those axions to lie in
the FDM range imposes constraints on the features of the internal manifold
. We also comment on implications for the Weak Gravity Conjecture.\nhttps:
//indico.desy.de/event/26540/contributions/110078/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110078/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Euclidean axion wormholes do not contribute to the path integral
DTSTART;VALUE=DATE-TIME:20210923T101000Z
DTEND;VALUE=DATE-TIME:20210923T102500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110079@indico.desy.de
DESCRIPTION:Speakers: Rob Tielemans (KU Leuven)\, Thomas Van Riet (KU Leuv
en)\, Thomas Hertog (KU Leuven)\nAxion fields coupled to gravity allow non
-trivial Euclidean saddle points that correspond to wormholes. Their possi
ble role in the path integral of quantum gravity has been a puzzle for ove
r 30 years. In this talk I will first explain that these saddle points are
unstable in a Euclidean sense even when additional axion or saxion fields
are added. Secondly\, the meaning of these instabilities will also be dis
cussed.\nhttps://indico.desy.de/event/26540/contributions/110079/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110079/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Understanding the spectrum of GRB 190114C
DTSTART;VALUE=DATE-TIME:20210923T100500Z
DTEND;VALUE=DATE-TIME:20210923T102000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110103@indico.desy.de
DESCRIPTION:Speakers: Marc Klinger (Z_THAT (Theoretische Astroteilchenphys
ik))\, Andrew Taylor (Z_THAT (Theoretische Astroteilchenphysik))\, Walter
Winter (DESY)\nThe recent very-high-energy (VHE) gamma-ray observations of
gamma-ray bursts (GRBs) in their afterglow phase motivate a review of the
established fireball model in which a relativistic blast wave accelerates
electrons in the forward shock\, which then radiate via the synchrotron p
rocess and inverse Compton scattering on these synchrotron photons (synchr
otron self-Compton). We use the rich observations of GRB 190114C ranging f
rom X-ray (keV) to VHE gamma-rays (TeV) to investigate the properties of t
he radiating electron distribution assuming a single emitting zone. We pre
sent preliminary modeling considering the landscape of solutions finding c
onsistency with the multi-wavelength observations\, and consider the impli
cations of these different solution groups.\nhttps://indico.desy.de/event/
26540/contributions/110103/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110103/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gravitational waves as probes of new physics
DTSTART;VALUE=DATE-TIME:20210921T121000Z
DTEND;VALUE=DATE-TIME:20210921T124000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109668@indico.desy.de
DESCRIPTION:Speakers: Pedro Schwaller\nhttps://indico.desy.de/event/26540/
contributions/109668/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/109668/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gravitational waves from cosmic inflation
DTSTART;VALUE=DATE-TIME:20210921T124000Z
DTEND;VALUE=DATE-TIME:20210921T131000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109669@indico.desy.de
DESCRIPTION:Speakers: Valerie Domcke\nhttps://indico.desy.de/event/26540/c
ontributions/109669/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/109669/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gravitational waves from first order phase transitions in the earl
y Universe.
DTSTART;VALUE=DATE-TIME:20210921T131000Z
DTEND;VALUE=DATE-TIME:20210921T134000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109681@indico.desy.de
DESCRIPTION:Speakers: Mark Hindmarsh\nhttps://indico.desy.de/event/26540/c
ontributions/109681/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/109681/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New Perspectives onto the Universe in the multi-messenger era
DTSTART;VALUE=DATE-TIME:20210921T144500Z
DTEND;VALUE=DATE-TIME:20210921T151500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109683@indico.desy.de
DESCRIPTION:Speakers: Samaya Nissanke\nhttps://indico.desy.de/event/26540/
contributions/109683/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/109683/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cosmology and new physics from large-scale structure.
DTSTART;VALUE=DATE-TIME:20210921T141500Z
DTEND;VALUE=DATE-TIME:20210921T144500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109684@indico.desy.de
DESCRIPTION:Speakers: Marko Simonovic\nhttps://indico.desy.de/event/26540/
contributions/109684/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/109684/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cosmology and astrophysics into the next decade.
DTSTART;VALUE=DATE-TIME:20210921T160000Z
DTEND;VALUE=DATE-TIME:20210921T170000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109685@indico.desy.de
DESCRIPTION:Speakers: Matias Zaldarriaga\nOver the past decades we have se
en remarkable improvements in our understanding of the Cosmos. We have bee
n able to determine the composition of the Universe\, its age and expansio
n history with outstanding precision. We have gathered very interesting cl
ues about the initial conditions of the hot Big Bang and developed models
that can explain them. We have discovered new phenomena and exotic objects
and have been able to use them as tools to learn about Cosmology. This
lecture will summarize our current understanding of the properties and his
tory of our Universe and focus on some of the open questions in the field
and describe some of the ongoing efforts to try to answer them.\nhttps://i
ndico.desy.de/event/26540/contributions/109685/
LOCATION:Main Auditorium (DESY Hamburg)
URL:https://indico.desy.de/event/26540/contributions/109685/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Neutrinos in cosmology.
DTSTART;VALUE=DATE-TIME:20210922T071500Z
DTEND;VALUE=DATE-TIME:20210922T074500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109686@indico.desy.de
DESCRIPTION:Speakers: Yvonne Wong\nhttps://indico.desy.de/event/26540/cont
ributions/109686/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/109686/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Directional DM detection.
DTSTART;VALUE=DATE-TIME:20210922T074500Z
DTEND;VALUE=DATE-TIME:20210922T081500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109687@indico.desy.de
DESCRIPTION:Speakers: Ciaran O'Hare\nhttps://indico.desy.de/event/26540/co
ntributions/109687/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/109687/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Black Holes.
DTSTART;VALUE=DATE-TIME:20210922T081500Z
DTEND;VALUE=DATE-TIME:20210922T084500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109688@indico.desy.de
DESCRIPTION:Speakers: Vitor Cardoso\nhttps://indico.desy.de/event/26540/co
ntributions/109688/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/109688/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On dark matter from a hidden sector.
DTSTART;VALUE=DATE-TIME:20210922T094500Z
DTEND;VALUE=DATE-TIME:20210922T101500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109689@indico.desy.de
DESCRIPTION:Speakers: Michel Tytgat\nhttps://indico.desy.de/event/26540/co
ntributions/109689/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/109689/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Progress with thermal rates for dark matter and leptogenesis.
DTSTART;VALUE=DATE-TIME:20210922T091500Z
DTEND;VALUE=DATE-TIME:20210922T094500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109690@indico.desy.de
DESCRIPTION:Speakers: Mikko Laine\nhttps://indico.desy.de/event/26540/cont
ributions/109690/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/109690/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New Physics with Gravitational Waves
DTSTART;VALUE=DATE-TIME:20210922T101500Z
DTEND;VALUE=DATE-TIME:20210922T104500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109691@indico.desy.de
DESCRIPTION:Speakers: Daniel Baumann\nhttps://indico.desy.de/event/26540/c
ontributions/109691/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/109691/
END:VEVENT
BEGIN:VEVENT
SUMMARY:IceCube constraints on the scotogenic model
DTSTART;VALUE=DATE-TIME:20210921T091500Z
DTEND;VALUE=DATE-TIME:20210921T093000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109988@indico.desy.de
DESCRIPTION:Speakers: Michael Klasen (WWU Münster)\, Alexander Kappes (Un
iversity Münster)\, Thede de Boer\, Sybrand Zeinstra\, Raffaela Busse\nIn
radiative seesaw models such as the famous scotogenic model\, neutrino ma
sses are generated through loop contributions involving dark matter (DM) p
articles. We study the capture of these DM candidates in the Sun as well a
s their subsequent annihilation into SM neutrinos and compute the expected
event rates at IceCube in its 86-string configuration. In particular\, in
the scotogenic model the two scalar components have a naturally small mas
s splitting\, so that also inelastic scattering mediated by Z-bosons must
be taken into account. Using a random scan\, we find that for mass splitti
ngs below 500 keV the event rates reach 10 to $10^6$ events per year and c
an thus be tested in a dedicated IceCube analysis. Direct detection is fou
nd to be less sensitive in the inelastic scenario due to the limited DM ve
locity on Earth. Depending on time\, other models and constraints will als
o be discussed.\nhttps://indico.desy.de/event/26540/contributions/109988/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109988/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Autoencoders for unsupervised anomaly detection in high energy phy
sics
DTSTART;VALUE=DATE-TIME:20210921T080500Z
DTEND;VALUE=DATE-TIME:20210921T082000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109991@indico.desy.de
DESCRIPTION:Speakers: Alessandro Morandini (RWTH Aachen University)\nN/A\n
https://indico.desy.de/event/26540/contributions/109991/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109991/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dark universe from (primordial) black holes
DTSTART;VALUE=DATE-TIME:20210923T071500Z
DTEND;VALUE=DATE-TIME:20210923T073500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109989@indico.desy.de
DESCRIPTION:Speakers: Rudin Petrossian-Byrne (University of Oxford )\nhttp
s://indico.desy.de/event/26540/contributions/109989/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109989/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A Gravitino Distance Conjecture
DTSTART;VALUE=DATE-TIME:20210923T102500Z
DTEND;VALUE=DATE-TIME:20210923T104000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110081@indico.desy.de
DESCRIPTION:Speakers: Luis E. Ibáñez (IFT UAM/CSIC)\, Alberto Castellano
Mora (IFT UAM/CSIC)\, Anamaría Font (Universidad Central de Venezuela &
Max Planck Institute)\, Alvaro Herraéz (IPhT Saclay)\nWe conjecture that
in a consistent supergravity theory with non-vanishing gravitino mass\, th
e limit $m_{3/2}→0$ is at infinite distance. In particular one can write
$m_{tower}∼m^δ_{3/2}$ so that as the gravitino mass goes to zero\, a t
ower of KK states as well as emergent strings becomes tensionless. This co
njecture may be motivated from the Weak Gravity Conjecture as applied to s
trings and membranes and implies in turn the AdS Distance Conjecture. Some
evidence in type IIA vacua and F-theory settings will be presented. Moreo
ver\, we obtain general lower bounds $δ≥1/3\,1/4$ for Calabi--Yau three
folds and fourfolds\, respectively. The conjecture has important phenomeno
logical implications\, both for particle physics and cosmology.\nBased on
2104.10181 [Castellano\, A.\, Font\, A.\, Herráez\, A. et al. A gravitino
distance conjecture. J. High Energ. Phys. 2021\, 92 (2021). https://doi.o
rg/10.1007/JHEP08(2021)092].\nhttps://indico.desy.de/event/26540/contribut
ions/110081/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110081/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Feynman Integrals and Calabi-Yau Mathematics
DTSTART;VALUE=DATE-TIME:20210923T075500Z
DTEND;VALUE=DATE-TIME:20210923T081500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110082@indico.desy.de
DESCRIPTION:Speakers: Christoph Nega (BCTP\, University of Bonn)\, Fabian
Fischbach (Bethe Center for Theoretical Physics)\, Claude Duhr (CERN)\, Al
brecht Klemm (Bethe Center for Theoretical Physics)\, Kilian Bönisch (Max
-Plank-Institut für Mathematik Bonn)\nIn this talk I will show how concep
ts from Calabi-Yau geometry and especially Calabi-Yau motives can be used
for computations of multi-loop Feynman integrals. This will be exemplified
with the so called banana graphs. First\, I will give a short introductio
n to Feynman integrals and Calabi-Yau manifolds. Then we will see how the
mathematics of Calabi-Yau manifolds (variations of Hodge structures\, Grif
fiths transversality\, $\\widehat \\Gamma$-class\, ...) constrain or even
determine the corresponding Feynman integral\, here the banana graphs. At
the end I will also shortly explain how the banana integrals can be solved
in dimensional regularization in the equal- as well as in the generic-mas
s case.\nhttps://indico.desy.de/event/26540/contributions/110082/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110082/
END:VEVENT
BEGIN:VEVENT
SUMMARY:(Rel-)axion fragmentation
DTSTART;VALUE=DATE-TIME:20210921T075000Z
DTEND;VALUE=DATE-TIME:20210921T080500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110100@indico.desy.de
DESCRIPTION:Speakers: Enrico Morgante (JGU Mainz)\nI will discuss the grow
th of quantum fluctuations of an axion field rolling down a potential with
multiple minima. This effect is particularly relevant for the relaxion me
chanism\, in which provides an alternarive stopping mechanism\, thus modif
ying the relevant parameter space. I will present new lattice results\, an
d discuss some cosmological aspects.\nhttps://indico.desy.de/event/26540/c
ontributions/110100/
URL:https://indico.desy.de/event/26540/contributions/110100/
END:VEVENT
BEGIN:VEVENT
SUMMARY:NLO electroweak potentials for minimal DM and beyond
DTSTART;VALUE=DATE-TIME:20210923T075000Z
DTEND;VALUE=DATE-TIME:20210923T080500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109961@indico.desy.de
DESCRIPTION:Speakers: Kai Urban (TU Munich)\nIn this talk\, I will discuss
the one-loop correction to the static potential induced by photon\, Z or
W-boson exchange at tree-level for arbitrary SM multiplets. The correction
is relevant\, e.g.\, in the Sommerfeld effect calculation for heavy WIMP
annihilation. We discuss the "Casimir-like" scaling of the result that mak
es the NLO correction a "low-energy" property of the SM gauge bosons. Furt
hermore\, we present the phenomenology of the NLO correction and the analy
tically known asymptotic limits.\nhttps://indico.desy.de/event/26540/contr
ibutions/109961/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109961/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tau-sleptons - a key role in dark matter coannihilations?
DTSTART;VALUE=DATE-TIME:20210923T080500Z
DTEND;VALUE=DATE-TIME:20210923T082000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109960@indico.desy.de
DESCRIPTION:Speakers: Johannes Branahl (WWU Münster)\, Michael Klasen (WW
U Münster)\nWe investigated stau-antistau annihilation into heavy q
uarks in the phenomenological MSSM within the DM@NLO collaboration.
This SUSY-QCD precision calculation\, enhanced by a QED Sommerfeld resumma
tion\, turned out to have several interesting applications: Claiming the
lightest neutralino to be a main dark matter constituent\, there are promi
sing\, non-excluded SUSY scenarios that demand higher-order corrections of
stau-coannihilations when computing the relic density. On the other hand\
, also in gravitino dark matter physics we show the important role of the
staus\, whose NLO corrections are inevitable for reliable predictions. \nM
oreover\, we illustrate the often neglected dependence of the cross sectio
n on renormalisation scheme and scale. Our variations aim to show how stro
ngly the prediction of the dark matter relic density is affected by such t
heoretical uncertainties\, which can be cured by taking higher-order corre
ctions into account.\nhttps://indico.desy.de/event/26540/contributions/109
960/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109960/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The $\\nu$DFSZ Axion model dubbed 2hdSMASH
DTSTART;VALUE=DATE-TIME:20210924T081500Z
DTEND;VALUE=DATE-TIME:20210924T083000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109962@indico.desy.de
DESCRIPTION:Speakers: Juhi Dutta (UNI/TH (Uni Hamburg\, Institut fuer Theo
retische Physik))\, Gudrid Moortgat-Pick (FLC (Technol. zukuenft. Teilchen
ph. Experim.))\, Andreas Ringwald (ALPS (Any Light Particle Search))\, Mic
hael Maxim Matlis (DESY)\nThe Standard Model (SM) suffers from five shortc
omings: Dark Matter\, Neutrino masses and mixing\, Baryon asymmetry\, Stro
ng CP-Problem and Inflation. The latter is regarded as the seeds for struc
ture formation. In this talk\, we introduce an inflationary $\\nu$DFSZ-typ
e model which is dubbed 2hdSMASH(Two-Higgs-Doublet SM*Axion*Seesaw*Higgs-P
ortal-Inflation). 2hdSMASH aims at giving a complete and unified picture o
f the universe evolution from the inflationary epoch to today. In particul
ar\, we focus on parameter constraints coming from the inflationary epoch
which provide in the low energy limit phenomenologically viable scalar mas
ses that can be tested at LHC\, HL-LHC or future colliders.\nhttps://indic
o.desy.de/event/26540/contributions/109962/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109962/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Anomaly detection with CATHODE
DTSTART;VALUE=DATE-TIME:20210921T075000Z
DTEND;VALUE=DATE-TIME:20210921T080500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109966@indico.desy.de
DESCRIPTION:Speakers: Matthias Schlaffer (University of Chicago)\nN/A\nhtt
ps://indico.desy.de/event/26540/contributions/109966/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109966/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Phenomenological Impact of Non-Perturbative Effects for Colored Da
rk Sectors
DTSTART;VALUE=DATE-TIME:20210922T132000Z
DTEND;VALUE=DATE-TIME:20210922T133500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109964@indico.desy.de
DESCRIPTION:Speakers: Mathias Becker (TU Dortmund)\, Julia Harz (Technical
University of Munich (TUM))\, Kirtimaan Mohan (MSU)\, Dipan Sengupta (UC
San Diego)\, Emanuele Copello\nWe demonstrate the impact of non-perturbati
ve effects on the Dark Matter (DM) production mechanism in simplified t-ch
annel DM models. Specifically\, we study the case of a Majorana fermion DM
\, coupled to the standard model (SM) quarks via a colored scalar.\nFor DM
masses in the GeV-TeV range\, direct detection experiments strongly const
rain the DM coupling to the SM quarks. From a cosmological point of view\,
however\, a large coupling to the SM is not mandatory if the mass splitti
ng between the colored scalar and the DM candidate is sufficiently small.
This region of the parameter space is subject to non-perturbative effects\
, namely the Sommerfeld effect and bound state formation via gluon emissio
n\, which can significantly enhance the effective DM (co)annihilation cros
s-section. \nWe present the impact of these effects on current and upcomin
g collider searches as well as on direct detection experiments.\nhttps://i
ndico.desy.de/event/26540/contributions/109964/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109964/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Probing Dirac vs Majorana nature of neutrinos at CE$\\nu$NS experi
ments
DTSTART;VALUE=DATE-TIME:20210921T093000Z
DTEND;VALUE=DATE-TIME:20210921T094500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109963@indico.desy.de
DESCRIPTION:Speakers: Chandan Hati (Technische Universität München\, Jam
es-Franck-Straße 1\, D-85748 Garching\, Germany)\, Kare Fridell (TUM)\,
Suchita Kulkarni (University of Graz)\, Frank Deppisch (UCL)\, Julia Ha
rz (TUM)\, Patrick Bolton (UCL)\nCoherent Elastic Neutrino Nucleus Scatt
ering (CE$\\nu$NS) provide a novel window to probe new physics connected w
ith the well established non-vanishing neutrino masses. In this talk we wi
ll discuss how in the presence of a transition magnetic moment of neutrino
s the CE𝜈NS experiments have the potential to shed light on the nature
of neutrinos: Dirac vs Majorana. In particular\, we will take the NUCLEUS
experiment as an example to demonstrate that through a study of differenti
al energy distribution of the final states the CEνNS experiments can pote
ntially achieve such a feat.\nhttps://indico.desy.de/event/26540/contribut
ions/109963/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109963/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mesogenesis
DTSTART;VALUE=DATE-TIME:20210924T071500Z
DTEND;VALUE=DATE-TIME:20210924T073000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109967@indico.desy.de
DESCRIPTION:Speakers: Gilly Elor (JGU Mainz)\nhttps://indico.desy.de/event
/26540/contributions/109967/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109967/
END:VEVENT
BEGIN:VEVENT
SUMMARY:GAZELLE\, a long-baseline detector for Belle II
DTSTART;VALUE=DATE-TIME:20210923T101000Z
DTEND;VALUE=DATE-TIME:20210923T102500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109965@indico.desy.de
DESCRIPTION:Speakers: Ruth Schäfer (U. Heidelberg)\nN/A\nhttps://indico.d
esy.de/event/26540/contributions/109965/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109965/
END:VEVENT
BEGIN:VEVENT
SUMMARY:SU(6) Gauge-Higgs Grand Unification
DTSTART;VALUE=DATE-TIME:20210924T073000Z
DTEND;VALUE=DATE-TIME:20210924T074500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109992@indico.desy.de
DESCRIPTION:Speakers: Andreas Bally (Max Planck Institute for Nuclear Phys
ics\, Heidelberg)\, Florian Goertz (MPIK)\, Simone Blasi (Vrije Universite
it Brussel (VUB)\, Belgium)\, Andrei Angelescu (Max Planck Institute for N
uclear Physics\, Heidelberg)\nIn this proposed talk\, we present a gauge-H
iggs grand unification setup that employs 5D warped space with a SU(6) bul
k gauge field that includes both a SU(5) grand unified theory (GUT) and a
Higgs sector as a scalar component of the 5D vector field\, solving the hi
erarchy problem. By appropriately breaking the gauge symmetry on the bound
aries of the extra dimension the issue of light exotic new states\, appear
ing generically in such models\, is eliminated and the SM fermion spectrum
is naturally reproduced. The Higgs potential is computed at one-loop\, fi
nding straightforward solutions with a realistic $m_h = 125$ GeV. The prob
lem of proton decay is addressed by showing that baryon number is a hidden
symmetry of the model. The presence of a scalar leptoquark and a scalar s
inglet\, whose potential we also compute at one-loop\, is highlighted whic
h might play a role in solving further problems of the SM. Finally\, the X
and Y gauge bosons from SU(5) GUTs are found at collider accessible masse
s\, opening a window to the unification structure at low energies.\nhttps:
//indico.desy.de/event/26540/contributions/109992/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109992/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dark Matter Phenomenology of 1-Loop Solutions to the R_K anomaly
DTSTART;VALUE=DATE-TIME:20210923T083500Z
DTEND;VALUE=DATE-TIME:20210923T085000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109993@indico.desy.de
DESCRIPTION:Speakers: Mathias Becker (TU Dortmund)\nN/A\nhttps://indico.de
sy.de/event/26540/contributions/109993/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109993/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Three-Body Effective Potential in General Relativity at 2PM and Re
sulting PN Contributions
DTSTART;VALUE=DATE-TIME:20210923T071500Z
DTEND;VALUE=DATE-TIME:20210923T073500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110080@indico.desy.de
DESCRIPTION:Speakers: Florian Loebbert (Humboldt-Universität zu Berlin)\,
Jan Plefka (Humboldt-Universität zu Berlin)\, Canxin Shi (Humboldt-Unive
rsität zu Berlin)\, Tianheng Wang (Humboldt-Universität zu Berlin)\nIn t
his talk\, I will talk about the Post-Newtonian expansion of the gravitati
onal three-body effective potential at the 2nd Post-Minkowskian order. At
order 2PM a formal result is given in terms of a differential operator act
ing on the maximal generalized cut of the one-loop triangle integral. We
perform the PN expansion unambiguously at the level of the integrand. Find
ing agreement with the 2PN three-body potential after integration\, we exp
licitly present new G^2 v^4-contributions at order 3PN and outline the gen
eralization to G^2 v^{2n}. The integrals that represent the essential inpu
t for these results respect a non-local Yangian symmetry and are obtained
by applying the recent bootstrapping method directly to their ε-expansion
around three dimensions. The coordinate space Yangian generator that we e
mploy to obtain these integrals can be understood as a special conformal s
ymmetry in a dual momentum space. If time permits\, I will also talk about
our work in progress on finding such integrals of generic half-integer pr
opagator powers.\nhttps://indico.desy.de/event/26540/contributions/110080/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110080/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A tale of two horizons and two cutoffs
DTSTART;VALUE=DATE-TIME:20210923T091500Z
DTEND;VALUE=DATE-TIME:20210923T093500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110065@indico.desy.de
DESCRIPTION:Speakers: Mohsen Alishahiha\, Souvik Banerjee (University of W
ürzburg)\, Joshua Kames-King\, Emma Loos\nBased on reasonable assumptions
\, we propose a new expression for Lloyd's bound\, which confines the comp
lexity growth of charged black holes. We then compute the holographic comp
lexity for charged black branes in the presence of a finite cutoff using c
omplexity = action proposal. We argue that a behind-the-horizon cutoff is
inevitable. Using the proposed Lloyd's bound\, we find a relation between
the ultraviolet and the behind-the-horizon cutoffs. This relation is found
to be consistent with the factorization of the partition function at lead
ing order in large N. We argue that the result may be thought of as a holo
graphic realization of strong cosmic censorship.\nhttps://indico.desy.de/e
vent/26540/contributions/110065/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110065/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Worldsheet Correlators in AdS3
DTSTART;VALUE=DATE-TIME:20210922T152500Z
DTEND;VALUE=DATE-TIME:20210922T154500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110066@indico.desy.de
DESCRIPTION:Speakers: Lorenz Eberhardt (IAS Princeton)\nWe revisit the com
putation of string correlation functions in AdS3 with pure NS-NS flux from
a worldsheet point of view. These correlators contain all the perturbativ
e information about the spacetime CFT and the existence of winding strings
in AdS3 makes them very rich. We propose a solution to the problem of com
puting these correlators. The winding correlators encode information about
branched covering maps from the worldsheet to the boundary of AdS3. Consi
stency of this proposal leads to many new and non-trivial relations for br
anched covering maps. I will discuss the properties of the correlators in
detail. In some limiting cases one can compute the full string correlators
and explore the spacetime CFT directly.\nhttps://indico.desy.de/event/265
40/contributions/110066/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110066/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Third Way to Interacting p-form Theories
DTSTART;VALUE=DATE-TIME:20210923T083000Z
DTEND;VALUE=DATE-TIME:20210923T084500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110068@indico.desy.de
DESCRIPTION:Speakers: Sadik Deger\, Stefan Theisen (AEI)\, Matteo Broccoli
(AEI Potsdam)\nIn three spacetime dimensions certain gravitational and ga
uge theories are `third way' consistent. This means that their equations o
f motion are only on-shell consistent and do not come from the variation o
f an action which contains the dynamical field alone. Although this mechan
ism is not special to 3d\, no higher dimensional third way consistent theo
ry was known. In this talk\, I will introduce the third way by presenting
the 3d theories and show how we recover them by shifting a flat gauge con
nection. Applying the same method in higher dimensions\, we find a new cla
ss of interacting $(d-2)$-form theories and I will discuss various general
isations of them. Our result proves that the third way can be realised in
dimensions higher than three\, and I will conclude by discussing the possi
bility of constructing new third way consistent theories of gravity.\nhttp
s://indico.desy.de/event/26540/contributions/110068/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110068/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pure Spinors and 11D Supergravity
DTSTART;VALUE=DATE-TIME:20210922T150500Z
DTEND;VALUE=DATE-TIME:20210922T152500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110070@indico.desy.de
DESCRIPTION:Speakers: Max Guillen (Uppsala University)\n11D supergravity h
as been conjectured to be the low-energy limit of a fundamental theory\, a
lso known as M-Theory\, which would contain non-perturbative information o
f string theory. In this talk\, I will discuss the so-called 11D pure spin
or superparticle whose quantization describes 11D supergravity in its anti
field formulation. Since scattering amplitudes require the introduction of
vertex operators carrying different ghost numbers\, I will explain how su
ch operators are constructed and the obstacle found when trying to define
a ghost number zero operator\, as well as the consequence of this issue on
the pure spinor description of M-Theory.\nhttps://indico.desy.de/event/26
540/contributions/110070/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110070/
END:VEVENT
BEGIN:VEVENT
SUMMARY:S-folds : global issues and symmetry breaking
DTSTART;VALUE=DATE-TIME:20210923T081500Z
DTEND;VALUE=DATE-TIME:20210923T083000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110069@indico.desy.de
DESCRIPTION:Speakers: Colin Sterckx (Université Libre de Bruxelles)\nNon-
geometric solutions of type IIB supergravity - called S-folds - have recen
tly attracted a lot of attention. They are of particular interest as they
can easily be seen as solutions of 4D and 5D gauged maximal supergravity.
Moreover\, they are conjectured to be the holographic dual of certain loca
lized interfaces in SYM$_4$. \nIn this talk we will review such solutions
and focus on their symmetry breaking pattern by exactly marginal deformati
ons. Using Exceptional Field Theory this will reveal a surprising behavior
as apparently non-compact deformations in 4D are realized as periodic def
ormations of the 10D uplift. We will characterize the monodromy-induced pa
tterns of symmetry breaking as classified by the mapping torus $T_h(S^5)$.
\nhttps://indico.desy.de/event/26540/contributions/110069/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110069/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The FL bound and its implications
DTSTART;VALUE=DATE-TIME:20210922T120000Z
DTEND;VALUE=DATE-TIME:20210922T122000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110071@indico.desy.de
DESCRIPTION:Speakers: Gerben Venken (ITP Heidelberg)\nThe Festina Lente (F
L) bound arises from demanding that very large charged black holes in univ
erses with a positive cosmological constant must decay without becoming si
ngular. The FL bound states that the mass of all charged states is bounded
from below by a scale set by the vacuum energy.\nIn this talk\, I will fi
rst review the argument for the FL bound from charged black hole decay. I
will discuss some of the pheno applications of the FL bound such as to the
electroweak hierarchy problem and to Higgs physics. I will discuss the FL
bound in a string theory context and go over what it implies for string c
ompactifications with a positive cosmological constant generally and antib
rane uplifts specifically.\n \nBased on 1910.01648 and 2106.07650 .\nhttps
://indico.desy.de/event/26540/contributions/110071/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110071/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Moduli stabilization near the boundary
DTSTART;VALUE=DATE-TIME:20210922T130000Z
DTEND;VALUE=DATE-TIME:20210922T131500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110072@indico.desy.de
DESCRIPTION:Speakers: Damian van de Heisteeg (Utrecht University)\nIn this
talk we discuss a novel approach to moduli stabilization in Type IIB flux
compactifications. Our strategy relies on recent insights about Calabi-Ya
u moduli spaces based on asymptotic Hodge theory. The crucial observation
is that exponential corrections must be present near most boundaries in th
ese moduli spaces. We then use these corrections to engineer new flux vacu
a with an exponentially small superpotential. These vacua are particularly
relevant from the perspective of the KKLT scenario\, and moreover feature
interesting hierarchies in the masses of the moduli.\nhttps://indico.desy
.de/event/26540/contributions/110072/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110072/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Weak gravity vs charged massless gravitini in de Sitter
DTSTART;VALUE=DATE-TIME:20210923T093500Z
DTEND;VALUE=DATE-TIME:20210923T095500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110073@indico.desy.de
DESCRIPTION:Speakers: Maxim Emelin (University of Padua)\, Fotis Farakos (
University of Padua)\, Gianguido Gall'Agata\, Matteo Morittu\nWe argue tha
t in extended supergravity\, de Sitter ctitical points with light charged
gravitini violate the magnetic weak gravity conjecture. We prove this stat
ement in general for N=2 matter-coupled gauged supergravity and demonstrat
e the result and its caveats through various examples. This result is req
uired by the "festina lente" bound\, but is derived independently\, and th
us serves as a non-trivial consistency check.\nhttps://indico.desy.de/even
t/26540/contributions/110073/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110073/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Virasoro-Shapiro amplitude in AdS5xS5 and level splitting of 1
0d conformal symmetry
DTSTART;VALUE=DATE-TIME:20210924T073500Z
DTEND;VALUE=DATE-TIME:20210924T075500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110074@indico.desy.de
DESCRIPTION:Speakers: Hynek Paul (IPhT Saclay)\nI will report on recent pr
ogress in bootstrapping the $\\alpha'$-expansion of the genus-zero four-po
int superstring amplitude on AdS_5\, dual to correlation functions of N=4
SYM at strong coupling. The construction of these amplitudes goes hand in
hand with a deeper understanding of the spectrum of double-trace operators
. As I will explain\, at the level of supergravity these operators exhibit
an interesting pattern of residual degeneracy\, which is then lifted by t
he tower of string corrections in a controlled fashion.\nhttps://indico.de
sy.de/event/26540/contributions/110074/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110074/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fate of the Electroweak Symmetry in the Early Universe in Multi-Hi
ggs models
DTSTART;VALUE=DATE-TIME:20210921T094500Z
DTEND;VALUE=DATE-TIME:20210921T100000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109969@indico.desy.de
DESCRIPTION:Speakers: Maria Olalla Olea Romacho (T (Phenomenology))\nN/A\n
https://indico.desy.de/event/26540/contributions/109969/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109969/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Portal Chiral Perturbation Theory
DTSTART;VALUE=DATE-TIME:20210923T095500Z
DTEND;VALUE=DATE-TIME:20210923T101000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109984@indico.desy.de
DESCRIPTION:Speakers: Chiara Arina (UCLouvain)\, Jan Hajer (UCLouvain)\, P
hilipp Klose (Bern University)\nHidden sector induced light meson transiti
ons are a powerful probe for new physics at low-energy fixed target experi
ments such as NA62. To help study such interactions\, we use the portal ef
fective theory framework to construct a portal chiral perturbation theory
at leading order that couples the light pseudoscalar mesons to a gauge-sin
glet messenger of spin 0\, 1/2\, or 1. We then compute general transition
amplitudes of three golden channels for hidden sector searches at fixed-ta
rget experiments.\nhttps://indico.desy.de/event/26540/contributions/109984
/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109984/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Simulating and unfolding LHC event with generative networks
DTSTART;VALUE=DATE-TIME:20210921T073000Z
DTEND;VALUE=DATE-TIME:20210921T075000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109981@indico.desy.de
DESCRIPTION:Speakers: Anja Butter (ITP Heidelberg)\nhttps://indico.desy.de
/event/26540/contributions/109981/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109981/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Long-lived particles and portal EFTs
DTSTART;VALUE=DATE-TIME:20210923T091500Z
DTEND;VALUE=DATE-TIME:20210923T093500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109980@indico.desy.de
DESCRIPTION:Speakers: Jan Hajer (UCLouvain)\nLong-lived particles appear i
n the Standard Model (SM) and are a common feature of its hidden sector ex
tensions.\nThe accelerator phenomenology of such models is dominated by th
e often long-lived messenger fields\, as they interact directly with the S
M.\nPortal effective field theories\, extend the usual effective theories
of the SM to include generic interactions with messenger fields to arbitra
ry hidden sectors.\nhttps://indico.desy.de/event/26540/contributions/10998
0/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109980/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards automated SM NLO corrections for all colliders
DTSTART;VALUE=DATE-TIME:20210922T130500Z
DTEND;VALUE=DATE-TIME:20210922T132000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109972@indico.desy.de
DESCRIPTION:Speakers: Pia Bredt (T (Phenomenology))\nN/A\nhttps://indico.d
esy.de/event/26540/contributions/109972/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109972/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Explaining B-Anomalies from flavorful U(1)' extensions\, safely
DTSTART;VALUE=DATE-TIME:20210922T141500Z
DTEND;VALUE=DATE-TIME:20210922T143000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109971@indico.desy.de
DESCRIPTION:Speakers: Tom Steudtner (TU Dortmund)\nN/A\nhttps://indico.des
y.de/event/26540/contributions/109971/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109971/
END:VEVENT
BEGIN:VEVENT
SUMMARY:CP violating phases in the strong interaction
DTSTART;VALUE=DATE-TIME:20210922T123500Z
DTEND;VALUE=DATE-TIME:20210922T125000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109970@indico.desy.de
DESCRIPTION:Speakers: Carlos Tamarit (Technische Universität München)\,
Björn Garbrecht (TUM)\, Wen-yuan Ai ( Université catholique de Louvain )
\, Juan S. Cruz (Technical University Munich)\nWe derive correlation funct
ions for massive fermions with a complex mass in the presence of a general
vacuum angle. For this purpose\, we first build the Green’s functions i
n the one-instanton background and then sum over the configurations of bac
kground instantons. The quantization of topological sectors follows for sa
ddle points of finite Euclidean action in an infinite spacetime volume and
the fluctuations about these. For the resulting correlation functions\, w
e therefore take the infinite-volume limit before summing over topological
sectors. In contrast to the opposite order of limits\, the chiral phases
from the mass terms and from the instanton effects come out to be aligned.
\nhttps://indico.desy.de/event/26540/contributions/109970/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109970/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Neutrino magnetic moment -- mass conundrum in the Light of Recent
Experiments
DTSTART;VALUE=DATE-TIME:20210921T090000Z
DTEND;VALUE=DATE-TIME:20210921T091500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109983@indico.desy.de
DESCRIPTION:Speakers: Sudip Jana (Max-Planck-Institut für Kernphysik)\nN/
A\nhttps://indico.desy.de/event/26540/contributions/109983/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109983/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Looking Forward to New Physics with the Forward Physics Facility
DTSTART;VALUE=DATE-TIME:20210923T093500Z
DTEND;VALUE=DATE-TIME:20210923T095500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109982@indico.desy.de
DESCRIPTION:Speakers: Felix Kling (DESY)\nN/A\nhttps://indico.desy.de/even
t/26540/contributions/109982/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109982/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Top-quark fragmentation into a Higgs boson with next-to-leading or
der accuracy
DTSTART;VALUE=DATE-TIME:20210922T125000Z
DTEND;VALUE=DATE-TIME:20210922T130500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109976@indico.desy.de
DESCRIPTION:Speakers: Colomba Brancaccio (RWTH)\nN/A\nhttps://indico.desy.
de/event/26540/contributions/109976/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109976/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complementarity of muon charged lepton flavour violating processes
in the MRSSM
DTSTART;VALUE=DATE-TIME:20210922T150000Z
DTEND;VALUE=DATE-TIME:20210922T151500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109973@indico.desy.de
DESCRIPTION:Speakers: Hyejung Stöckinger-Kim (TU Dresden)\, Wojciech Ko
tlarski (TU Dresden)\, Dominik Stöckinger (TU Dresden)\, Uladzimir Khasia
nevich (TU Dresden)\nThe Minimal R-symmetric Supersymmetric Standard Model
possesses interesting features\, which makes it an attractive alternative
to the MSSM. Some of them can be observed in and are reflected by the lep
ton flavour violation processes. Notably\, there is no $\\tan\\beta$-enhan
cement for $g-2$ of the muon and other dipole operators\, resulting in ver
y different predictions for lepton observables compared to the MSSM.\n\nIn
the view of forthcoming experiments the bounds obtained from muon $g-2$ a
nd flavour violating observables on the model parameter regions are studie
d. In particular\, we consider the influence of Yukawa-like lambda paramet
ers of the superpotential and the off-diagonal entries of slepton mass mat
rices. Different scenarios are discussed\, depending also on the mass spec
tra of the model and additional restrictions\, imposed by the anomalous ma
gnetic moment of the muon. We focus on the interplay between $\\mu\\to e\\
gamma$\, $\\mu\\to e$ conversion and $\\mu\\to 3e$ and $g-2$ of the muon a
nd show that all of these observables are important to constrain the param
eter space.\nhttps://indico.desy.de/event/26540/contributions/109973/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109973/
END:VEVENT
BEGIN:VEVENT
SUMMARY:QED factorization of two-body non-leptonic and semi-leptonic B to
charm decays
DTSTART;VALUE=DATE-TIME:20210922T143000Z
DTEND;VALUE=DATE-TIME:20210922T144500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109975@indico.desy.de
DESCRIPTION:Speakers: Martin Beneke (Physik Department T31\, TUM)\, Gael F
inauri (Physik Department T31\, TUM)\, Philipp Böer (Physik Department T3
1\, TUM)\, K. Keri Vos (Nikhef\, Amsterdam. GWFP\, Maastricht University)\
nTwo-body non-leptonic $B$ decays with heavy-light final states\, like $B_
s \\to D \\pi$ and $B \\to D K$\, are among the theoretically cleanest non
-leptonic decays as penguin loops do not contribute. They can be described
using QCD factorization which relies on the heavy quark expansion. Advanc
ing the theoretical calculations of such decays requires also a careful an
alysis of QED effects. In this talk we present a treatment of both virtual
and ultrasoft real QED effects within a QCD $\\times$ QED factorization f
ramework of the non-leptonic and semi-leptonic $B$ to $D$ decays. In parti
cular\, due to recent discrepancies between theory and experimental data\,
we focus on ratios of non-leptonic over semi-leptonic decay rates\, which
are theoretically clean observables as the form factor dependence drops s
ignificantly. We found QED corrections to the amplitude to be at the sub-p
ercent level\, while at the level of the rate\, ultrasoft photon effects c
an produce a correction up to a few percent\, requiring a careful treatmen
t of such effects in the experimental analyses.\nhttps://indico.desy.de/ev
ent/26540/contributions/109975/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109975/
END:VEVENT
BEGIN:VEVENT
SUMMARY:(g-2)𝜇\, B anomalies and DM: a loop model tale
DTSTART;VALUE=DATE-TIME:20210922T140000Z
DTEND;VALUE=DATE-TIME:20210922T141500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109974@indico.desy.de
DESCRIPTION:Speakers: Marco Fedele (KIT)\nIn this talk I will review how t
he anomalous magnetic moment of the muon and the B anomalies can be addres
sed by a combined explanation\, by means of loop models characterized by m
inimal field content. Moreover\, I will show how some of these model can a
lso provide a viable DM candidate\, accounting for the measured relic dens
ity while evading direct and indirect DM constraints.\nhttps://indico.desy
.de/event/26540/contributions/109974/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109974/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Interplay of dineutrino modes with semileptonic rare B-decays
DTSTART;VALUE=DATE-TIME:20210922T144500Z
DTEND;VALUE=DATE-TIME:20210922T150000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109978@indico.desy.de
DESCRIPTION:Speakers: Hector Gisbert Mullor (TU Dortmund)\nN/A\nhttps://in
dico.desy.de/event/26540/contributions/109978/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109978/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The on-shell SMEFTs
DTSTART;VALUE=DATE-TIME:20210922T120000Z
DTEND;VALUE=DATE-TIME:20210922T122000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109977@indico.desy.de
DESCRIPTION:Speakers: Gauthier Durieux (CERN)\nhttps://indico.desy.de/even
t/26540/contributions/109977/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109977/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dark matter phenomenology in two higgs doublet model with a compl
ex scalar singlet
DTSTART;VALUE=DATE-TIME:20210923T073500Z
DTEND;VALUE=DATE-TIME:20210923T075000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109979@indico.desy.de
DESCRIPTION:Speakers: Juhi Dutta (UNI/TH (Uni Hamburg\, Institut fuer Theo
retische Physik))\, Merle Schreiber (University of Hamburg)\, Gudrid Moort
gat-Pick (DESY & University of Hamburg)\nExtensions of the two higgs doubl
et models with a singlet scalar can easily accommodate all current experim
ental constraints and are highly motivated candidates for Beyond Standard
Model Physics. It can successfully provide a dark matter candidate\, expla
in baryogenesis and provide gravitational wave signals. In this work\, we
focus on the dark matter phenomenology of the two higgs doublet model exte
nded with a complex scalar singlet which serves as the dark matter candida
te. We study the variations of the dark matter observables\, i.e relic den
sity and direct detection cross-section\, with respect to the model parame
ters. We obtain a few benchmark points in the light and heavy dark matter
mass region. We are also currently studying possible signatures of this mo
del at current and future colliders and the possibility to distinguish thi
s model from\nother new physics scenarios.\nhttps://indico.desy.de/event/2
6540/contributions/109979/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109979/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cosmology from GW.
DTSTART;VALUE=DATE-TIME:20210923T123000Z
DTEND;VALUE=DATE-TIME:20210923T130000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109995@indico.desy.de
DESCRIPTION:Speakers: Danièle Steer\nhttps://indico.desy.de/event/26540/c
ontributions/109995/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/109995/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Is the Hubble Tension Signaling New Physics?
DTSTART;VALUE=DATE-TIME:20210923T130000Z
DTEND;VALUE=DATE-TIME:20210923T133000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109996@indico.desy.de
DESCRIPTION:Speakers: Wendy Freedman\nhttps://indico.desy.de/event/26540/c
ontributions/109996/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/109996/
END:VEVENT
BEGIN:VEVENT
SUMMARY:New developments in indirect dark matter searches.
DTSTART;VALUE=DATE-TIME:20210923T133000Z
DTEND;VALUE=DATE-TIME:20210923T140000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109997@indico.desy.de
DESCRIPTION:Speakers: Tracy Slatyer\nhttps://indico.desy.de/event/26540/co
ntributions/109997/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/109997/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stringy cosmology and DM.
DTSTART;VALUE=DATE-TIME:20210923T143000Z
DTEND;VALUE=DATE-TIME:20210923T150000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109998@indico.desy.de
DESCRIPTION:Speakers: Matthew Reece\nhttps://indico.desy.de/event/26540/co
ntributions/109998/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/109998/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Axions from the cosmos to the laboratory.
DTSTART;VALUE=DATE-TIME:20210923T150000Z
DTEND;VALUE=DATE-TIME:20210923T153000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109999@indico.desy.de
DESCRIPTION:Speakers: Ben Safdi\nhttps://indico.desy.de/event/26540/contri
butions/109999/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/109999/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Future CMB Probes of the Dark Universe.
DTSTART;VALUE=DATE-TIME:20210923T153000Z
DTEND;VALUE=DATE-TIME:20210923T160000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110000@indico.desy.de
DESCRIPTION:Speakers: Daniel Green\nhttps://indico.desy.de/event/26540/con
tributions/110000/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110000/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dark energy and gravitational waves.
DTSTART;VALUE=DATE-TIME:20210924T093000Z
DTEND;VALUE=DATE-TIME:20210924T100000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110002@indico.desy.de
DESCRIPTION:Speakers: Filippo Vernizzi\nhttps://indico.desy.de/event/26540
/contributions/110002/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110002/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Recent Discoveries on Very High Energy Emission from GRBs.
DTSTART;VALUE=DATE-TIME:20210924T100000Z
DTEND;VALUE=DATE-TIME:20210924T103000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110003@indico.desy.de
DESCRIPTION:Speakers: Andrew Taylor\nhttps://indico.desy.de/event/26540/co
ntributions/110003/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110003/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Charming ALPs
DTSTART;VALUE=DATE-TIME:20210924T080000Z
DTEND;VALUE=DATE-TIME:20210924T081500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109986@indico.desy.de
DESCRIPTION:Speakers: Christiane Scherb (Johannes Gutenberg-Universität M
ainz)\nAxion-like particles (ALPs) are ubiquitous in models of new physics
explaining some of the most\npressing puzzles of the Standard Model. Howe
ver\, until relatively recently\, little attention has been\npaid to its i
nterplay with flavour. In this work\, we study in detail the phenomenology
of ALPs\nthat exclusively interact with up-type quarks at the tree-level\
, which arise in some well-motivated\nultra-violet completions such as QCD
-like dark sectors or Froggatt-Nielsen type models of flavour.\nOur study
is performed in the low-energy effective theory to highlight the key featu
res of these\nscenarios in a model independent way. We derive all the exis
ting constraints on these models and\ndemonstrate how upcoming experiments
at fixed-target facilities and the LHC can probe regions of\nthe paramete
r space which are currently not excluded by cosmological and astrophysical
bounds. Possible signatures of flavour violating displaced decays are dis
cussed. We\nalso emphasize how a future measurement of the currently unava
ilable meson decay D → π+invisible\ncould complement these upcoming sea
rches.\nhttps://indico.desy.de/event/26540/contributions/109986/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109986/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Statistics of Axion Physics in the Landscape
DTSTART;VALUE=DATE-TIME:20210924T090000Z
DTEND;VALUE=DATE-TIME:20210924T093000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110001@indico.desy.de
DESCRIPTION:Speakers: Michele Cicoli\nhttps://indico.desy.de/event/26540/c
ontributions/110001/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110001/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Light-cone distribution amplitudes in QCD$\\times$QED
DTSTART;VALUE=DATE-TIME:20210922T122000Z
DTEND;VALUE=DATE-TIME:20210922T123500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109985@indico.desy.de
DESCRIPTION:Speakers: Philipp Böer (Technical University of Munich)\, Jan
-Niklas Toelstede (Technical University of Munich)\, Martin Beneke (Techni
cal University of Munich)\, Keri Vos (Maastricht University)\nLight-cone d
istribution amplitudes (LCDAs) of light and heavy mesons are universal had
ronic objects that form an essential part of factorization theorems for ha
rd exclusive particle decays. These are relevant for precise calculations
of Standard Model processes which play an important role in the search for
New Physics. Like parton distribution functions\, LCDAs are process-indep
endent quantities that contain non-perturbative information about the inne
r meson structure and evolve under the renormalization group. The standard
definition of the LCDAs assumes the presence of QCD-only\, neglecting ele
ctromagnetic effects at low energies. However\, with the increasing precis
ion of measurements at LHCb and Belle II\, QED effects need to be consider
ed. For non-leptonic\, charmless $B$-meson decays\, we recently generalize
d the definition of the LCDAs to QCD$\\times$QED\, leading to qualitativel
y new features. In this talk we present\, mostly for light mesons\, how QE
D affects the solution of the LCDA under scale evolution. In particular\,
we discuss the modification of the endpoint behaviour and the size of QED
corrections for the inverse moments\, which enter on the level of physical
observables.\nhttps://indico.desy.de/event/26540/contributions/109985/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109985/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Supersymmetric Alignment Models for muon g-2
DTSTART;VALUE=DATE-TIME:20210922T151500Z
DTEND;VALUE=DATE-TIME:20210922T153000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109990@indico.desy.de
DESCRIPTION:Speakers: Motoo Suzuki (ICRR\, The University of Tokyo)\, Yuic
hiro Nakai (SJYU&TDLI)\, Matthew Reece (Harvard U.)\nHierarchical masses o
f quarks and leptons are addressed by imposing horizontal symmetries. In s
upersymmetric Standard Models\, the same symmetries play a role in suppres
sing flavor violating processes induced by supersymmetric particles. Combi
ning the idea of spontaneous CP violation to control contributions to elec
tric dipole moments (EDMs)\, the mass scale of supersymmetric particles ca
n be lowered. We present supersymmetric models with U(1) horizontal symmet
ries and discuss CP and flavor constraints. Models with two U(1) symmetrie
s are found to give a viable solution to the muon g−2 anomaly. Interesti
ngly\, the parameter space to explain the anomaly will be probed by future
electron EDM experiments.\nhttps://indico.desy.de/event/26540/contributio
ns/109990/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109990/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Scale-separated AdS4 vacua of IIA orientifolds and M-theory
DTSTART;VALUE=DATE-TIME:20210922T131500Z
DTEND;VALUE=DATE-TIME:20210922T133000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110075@indico.desy.de
DESCRIPTION:Speakers: Vincent Van Hemelryck (KU Leuven)\nObtaining string
compactifications where the KK scale is much higher than the cosmological
constant scale is quite challenging. Such a separation of scales is howeve
r necessary for the theory to be genuinely lower-dimensional.\nIn massive
type IIA string theory there are such scale-separated vacua\, e.g. the DGK
T AdS$_4$ solutions. It has been shown recently that the classical orienti
fold backreaction in these vacua can be tuned small. In this talk I show t
hat massless IIA on the other hand allows both weakly and strongly coupled
AdS$_4$ vacua that exhibit scale separation and for which the backreactio
n can be tuned small as well. I will give evidence that the strongly coupl
ed solutions can be lifted to scale separated and sourceless (but classica
lly singular) geometries in 11D supergravity.\nhttps://indico.desy.de/even
t/26540/contributions/110075/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110075/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Spin-2 mediated Dark Matter in Warped Extra-Dimensions
DTSTART;VALUE=DATE-TIME:20210923T082000Z
DTEND;VALUE=DATE-TIME:20210923T083500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109968@indico.desy.de
DESCRIPTION:Speakers: Stefan Vogl (Max-Planck-Institut für Physik)\, Artu
ro de Giorgi (Institute of Theoretical Physics - IFT (Madrid))\nWe present
a study of spin-2 mediated scalar dark matter. As a blueprint\, we work i
n a warped extra-dimensional model such that the mediator(s) are the massi
ve spin-2 Kaluza-Klein (KK) modes of the 5D graviton. On top of Standard M
odel particles\, we focus on dark matter annihilations into KK-gravitons.
Due to the longitudinal modes of the massive gravitons\, any truncation of
the KK-tower leads to a tremendous growth of the amplitude at large cente
r of mass energies √s\, which heavily impacts any phenomenological analy
sis. For the first time\, we include the full KK-tower in this dark matter
production process and find that this growth is unphysical and cancels on
ce the full field content of the extra-dimensional theory is taken into ac
count. Interestingly\, this implies that it is not possible to approximate
the results obtained in the full theory with a reduced set of effective i
nteractions once √s is greater than the lightest massive graviton. This
casts some doubt on the universal applicability of previous studies with s
pin-2 mediators within an EFT framework and prompts us to revisit the phen
omenological allowed parameter space.\nhttps://indico.desy.de/event/26540/
contributions/109968/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109968/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Small size instanton effects in composite axion models
DTSTART;VALUE=DATE-TIME:20210924T074500Z
DTEND;VALUE=DATE-TIME:20210924T080000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-109987@indico.desy.de
DESCRIPTION:Speakers: Felix Yu (JGU Mainz)\, Julien Laux (Universität Mai
nz)\, Alexey Kivel (Johannes Gutenberg University\, Physics Institute)\nWe
examine phenomenological properties of a heavy axion by considering small
size instanton effects coming from an additional axicolor non-Abelian gau
ge group. To properly take instanton effects into account\, we develop a n
ew method to derive and diagonalize the mass matrix of pseudoscalar fields
of the theory. Applying our new method for theories without axicolor inst
anton effects leads to good agreement with established effective field the
ory calculations. Using our method on axion models with additional non-Abe
lian gauge symmetries\, the small size instanton effects shifts the electr
omagnetic decay constant $F_a$ and axion mass $m_a$\, which we show as new
bands in the \\{$m_a\,G_{a\\gamma\\gamma}$\\}-plane. Our results show tha
t the axion can be heavy and still solve the Strong CP-problem. Such an ax
ion is unconstrained by stellar cooling bounds and could be probed by futu
re colliders such as FCC.\nhttps://indico.desy.de/event/26540/contribution
s/109987/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/109987/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Boundaries and Topological Twists of 3d N=4 SCFTs
DTSTART;VALUE=DATE-TIME:20210921T075500Z
DTEND;VALUE=DATE-TIME:20210921T081500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110054@indico.desy.de
DESCRIPTION:Speakers: Ilka Brünner\, Ioannis Lavdas (LMU Munich)\, Ingmar
Saberi\n3d *N*=4 theories are of particular interest as they admit variou
s types of twists (topological-holomorphic). A framework with interesting
implications is the one of topologically twisted 3d *N*=4 theories with *h
olomorphic* boundaries/defects. The significance of these configurations r
elies on the fact that local boundary operators form special Vertex operat
or algebras\, the study of which can shed light on the structure of the to
pological bulk theory. A central question is the compatibility of such hol
omorphic boundary conditions with the bulk topological twist. In this talk
I will discuss about certain aspects of such configurations using purely
string theoretical and field theoretical approaches. *To appear\, in colla
boration with I. Brünner and I. A. Saberi.*\nhttps://indico.desy.de/event
/26540/contributions/110054/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110054/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holography\, 1-Form Symmetries\, and Confinement
DTSTART;VALUE=DATE-TIME:20210921T081500Z
DTEND;VALUE=DATE-TIME:20210921T083000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110055@indico.desy.de
DESCRIPTION:Speakers: Fabio Apruzzi (University of Oxford)\, Marieke van B
eest (University of Oxford)\, Sakura Schafer-Nameki (University of Oxford)
\, Dewi S. W. Gould (University of Oxford)\nI will discuss confinement in
4d $\\mathcal{N=1}$ $SU(N)$ Super-Yang Mills from a holographic point of v
iew\, focusing on the 1-form symmetry and its relation to chiral symmetry
breaking. We will see how to identify the topological couplings that deter
mine the 1-form symmetry and its ’t Hooft anomalies from the 5d supergra
vity dual\, obtained by truncation of the Klebanov-Strassler solution. One
such coupling is a mixed 0-/1-form symmetry anomaly closely related to ch
iral symmetry breaking in gapped confining vacua. Finally\, we will derive
the IR 4d topological field theory\, which realises chiral symmetry break
ing and matches the mixed anomaly\, from the dual gravity description.\nht
tps://indico.desy.de/event/26540/contributions/110055/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110055/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Multipoint Conformal Blocks from Gaudin models
DTSTART;VALUE=DATE-TIME:20210921T090000Z
DTEND;VALUE=DATE-TIME:20210921T091500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110056@indico.desy.de
DESCRIPTION:Speakers: Sylvain Lacroix (UNI/TH (Uni Hamburg\, Institut fuer
Theoretische Physik))\, Volker Schomerus (T (Theorie))\, Jeremy Mann (DES
Y)\, Ilija Buric (DESY)\, Lorenzo Quintavalle (DESY)\nIn this talk\, I wil
l review our recent progress on the characterization of multipoint conform
al blocks in any spacetime dimension $d$ and any OPE channel.\nOur approac
h extends the standard four-point Casimir equations\, introduced by Dolan
and Osborn\, to a set of higher-point eigenvalue equations of commuting op
erators that also measure quantum numbers associated with vertices of OPE
diagrams. \nWe obtained the relevant set of commuting operators from speci
al limits of Hamiltonians of Gaudin models\, and we showed that in $d\\ge
3$ their solutions require a distinguished basis of three-point tensor str
uctures at every vertex. In the simplest example of comb-channel vertices\
, this basis corresponds to eigenfunctions of an elliptic Calogero-Sutherl
and-Moser model originally discovered by Etingof\, Felder\, Ma\, and Vesel
ov.\nhttps://indico.desy.de/event/26540/contributions/110056/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110056/
END:VEVENT
BEGIN:VEVENT
SUMMARY:N-point correlators in 1d CFT
DTSTART;VALUE=DATE-TIME:20210921T100000Z
DTEND;VALUE=DATE-TIME:20210921T101500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110057@indico.desy.de
DESCRIPTION:Speakers: Julien Barrat (Humboldt-Universität zu Berlin)\, Pe
dro Liendo Cordova (T (Stringtheory))\, Giulia Peveri (Humboldt-Universit
ät zu Berlin)\, Jan Plefka (Humboldt University Berlin)\nOne dimensional
CFTs are an exceptional laboratory in which we can test novel techniques i
n order to solve higher dimensional CFTs. They are also interesting from a
n holographic point of view\, as in the case of conformal line defects in
4d N=4 Super Yang-Mills. In this short talk\, I will present a recursive
prescription to compute\, up to one loop\, 4d N=4 SYM n-point correlation
functions realised inserting protected operators on a 1/2-BPS Wilson line.
Surprisingly\, this relation also contains all the information needed to
obtain any correlation function of non-protected operators and to extract
their anomalous dimension.\nhttps://indico.desy.de/event/26540/contributio
ns/110057/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110057/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Localization and protected subsectors
DTSTART;VALUE=DATE-TIME:20210922T154500Z
DTEND;VALUE=DATE-TIME:20210922T160000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110053@indico.desy.de
DESCRIPTION:Speakers: Pieter Bomans (University of Padova)\, Nikolay Bobev
(KU Leuven)\, Fridrik Gautason (University of Iceland)\nIn general it is
extremely difficult to obtain exact non-perturbative information about the
operator product expansion (OPE) of a given CFT. In this quest protected
sectors play an incredibly important role as in some cases they allow us t
o obtain the full answer for a subset of the operators in the theory. Impo
rtant examples of this phenomenon occur in 4d $\\mathcal{N}=2$ and 6d $\\m
athcal{N}=(2\,0)$ SCFT in which the correlation functions for a subset of
operators are governed by a chiral algebra. In this talk I will focus on t
he 6d case and show how this chiral algebra can be obtained through locali
zation. This approach allows us to extend our computations to CFTs in diff
erent backgrounds beyond flat space.\nhttps://indico.desy.de/event/26540/c
ontributions/110053/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110053/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Defects in 3d N = 2 superconformal theories
DTSTART;VALUE=DATE-TIME:20210921T091500Z
DTEND;VALUE=DATE-TIME:20210921T093000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110058@indico.desy.de
DESCRIPTION:Speakers: Philine Julia van Vliet (DESY)\nThe conformal bootst
rap is a powerful\, nonperturbative method to study\nconformal field theor
ies (CFTs). Advancements in especially the numerical bootstrap have led to
extremely precise results for the computation of critical exponents in va
rious CFTs\, and the conformal bootstrap\nhas gained a lot of attention in
recent years. The conformal bootstrap can be\ngeneralized/modified to inc
lude defect CFTs: CFTs with extended objects that break the (super-)confor
mal symmetry group into a smaller (super-\n)conformal subgroup. Defect the
ories appear in many places in theoretical\nphysics: from Wilson lines in
high-energy string theory\, to boundary CFTs\nfound in low-energy condense
d matter physics.\nWe studied three-dimensional CFTs with N = 2 supersymme
try equipped\nwith different 1/2-BPS defects (boundary and line). Such the
ories allow two\ntypes of boundaries\, of which one can be analytically co
ntinued to d = 4\, and\nwe bootstrapped the observables in the 4 − ε ex
pansion. They also allow one\ntype of (twisted) line defect\, of which we
computed several observables using\nnumerical techniques.\nhttps://indico.
desy.de/event/26540/contributions/110058/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110058/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bootstrapping Monodromy Defects in the Wess-Zumino Model
DTSTART;VALUE=DATE-TIME:20210921T093000Z
DTEND;VALUE=DATE-TIME:20210921T094500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110059@indico.desy.de
DESCRIPTION:Speakers: Aleix Gimenez Grau (DESY)\, Liendo Pedro (DESY)\nWe
use analytical bootstrap techniques to study supersymmetric monodromy de-\
nfects in the critical Wess-Zumino model. In preparation for our main resu
lt we first study two related systems which are interesting on their own:
general monodromy defects (no susy)\, and the ε–expansion bootstrap for
the Wess-Zumino model (no defects). For general monodromy defects we disc
uss some subtleties specific to the codimension two case. In particular\,
conformal blocks and the Lorentzian inversion formula have to be slightly
modified in order to accommodate odd-spin operators that can have a non-ze
ro one-point function. In the Wess-Zumino model we initiate the ε–expan
sion bootstrap for four-point functions of chiral operators\, with the goa
l of obtaining spectral information about the bulk theory. We then proceed
to tackle the harder technical problem of analyzing monodromy defects in
the presence of supersymmetry. We use inversion formula technology and spe
ctral data coming from our four-point function analysis\, in order to comp
letely bootstrap two-point functions of chiral operators at leading order
in ε. Our result can be written in terms of novel special functions which
we analyze in detail\, and allows us to efficiently extract the CFT data
that characterizes\nthe correlator.\nhttps://indico.desy.de/event/26540/co
ntributions/110059/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110059/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Six-Loops in N=4 super-Yang-Mills Theory
DTSTART;VALUE=DATE-TIME:20210923T073500Z
DTEND;VALUE=DATE-TIME:20210923T075500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110077@indico.desy.de
DESCRIPTION:Speakers: Henrik Johansson (Uppsala university)\, John Joseph
Carrasco (Northwestern University &\; CEA-Saclay)\, Alex Edison (Uppsa
la University)\nWe construct the complete (planar and non-planar) integran
d for the\n six-loop four-point amplitude in maximal $D\\le10$ super-Yang
-Mills.\n This construction employs new advances to help combat the\n pr
oliferation of state-sums and loops in the evaluation of\n multi-loop $D$
-dimensional unitarity cuts. Concretely\, we introduce\n two graph-based
approaches\, applicable in a range of theories\, to\n evaluating general
ized unitarity cuts in $D$ dimensions: 1)\n recursively from lower-loop c
uts\, or 2) directly from known\n higher-loop planar cuts. Neither metho
d relies on explicit state\n sums or any sewing of tree-level amplitudes.
The first method\n meshes particularly well with the Method of Maximal
Cuts to allow\n direct construction of the complete six-loop integrand\nh
ttps://indico.desy.de/event/26540/contributions/110077/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110077/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Integrability and chaos in sYM theories from the anomalous-dimenis
on spectrum
DTSTART;VALUE=DATE-TIME:20210924T075500Z
DTEND;VALUE=DATE-TIME:20210924T081500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110060@indico.desy.de
DESCRIPTION:Speakers: Anne Spiering (Trinity College Dublin)\nThe discover
y of integrability in planar N=4 sYM theory led to considerable advances i
n the computation of planar anomalous dimensions. In this talk I will disc
uss universal statistical properties of anomalous-dimension spectra in sYM
theories in the planar limit and at finite rank of the gauge group. I wil
l show how they can give insight into the nature of the underlying model\,
in particular we will see integrability manifest itself in spectra of int
egrable spin chains\, while non-planar spectra\, as well as spectra of non
-integrable spin chains\, can be described by random matrix theory.\nhttps
://indico.desy.de/event/26540/contributions/110060/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110060/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gauged 2-form symmetries in 6D SCFTs coupled to Gravity
DTSTART;VALUE=DATE-TIME:20210922T122000Z
DTEND;VALUE=DATE-TIME:20210922T124000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110062@indico.desy.de
DESCRIPTION:Speakers: Paul-Konstantin Oehlmann (Uppsala University)\, Andr
eas Braun (Durham University)\, Magdalena Larfors (Uppsala University)\n6D
SCFTs admit a plethora of global symmetries that \nspecify subtle global
properties\, such as 2-form symmetries.\nWhen coupled to gravity those sym
metries are expected to be\neither broken or gauged. \nIn this talk I pres
ent a simple geometric condition for the\nlater option to be the case that
is applicable to (2\,0) and\n(1\,0) theories. I give further evidence by
relating such examples to gauged\n1-form symmetries in lower dimensions vi
a dualities.\nhttps://indico.desy.de/event/26540/contributions/110062/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110062/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Landau Discriminant
DTSTART;VALUE=DATE-TIME:20210922T140000Z
DTEND;VALUE=DATE-TIME:20210922T142000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110076@indico.desy.de
DESCRIPTION:Speakers: Sebastian Mizera (IAS Princeton)\, Simon Telen (MPI
for Mathematics in the Sciences\, Leipzig)\nScattering amplitudes in quant
um field theories have intricate analytic properties as functions of the e
nergies and momenta of the scattered particles. In perturbation theory\, t
heir singularity structure is governed by nonlinear polynomial systems kno
wn as *Landau equations*. In this work we introduce several tools from com
putational algebraic geometry to solving Landau equations for any individu
al Feynman diagram. Singularity locus of the associated Feynman integral i
s made precise with the notion of the *Landau discriminant*. In order to s
olve it\, we discuss two basic approaches from classical elimination theor
y\, as well as a new algorithm based on tools from numerical nonlinear alg
ebra such as homotopy continuation. These methods allow us to compute Land
au discriminants of various Feynman diagrams up to $3$ loops\, including t
he envelope diagram whose Landau discriminant is a reducible surface of de
gree $45$ in the space of kinematic invariants $\\mathbb{P}^3$. In additio
n\, we construct *Landau polytopes* in order to study degenerations of Lan
dau equations and exemplify them on the family of banana diagrams. As a by
product\, we provide an efficient algorithm for the computation of the num
ber of master integrals based on the connection to algebraic statistics.\n
https://indico.desy.de/event/26540/contributions/110076/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110076/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Loops in (A)dS/CFT
DTSTART;VALUE=DATE-TIME:20210922T144000Z
DTEND;VALUE=DATE-TIME:20210922T145500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110063@indico.desy.de
DESCRIPTION:Speakers: Till Heckelbacher (LMU Munich)\nIn this talk we will
analyse loop corrections to a conformally coupled scalar field with a qua
rtic self-interaction in $(A)dS_4$ from a holographic perspective. First w
e will remark on the similarities and differences of quantum field theory
in $AdS$ and $dS$. We will then calculate the quantum corrections to the f
our point function and give a formula for the anomalous dimensions of the
dual double trace operators. The method we use is a direct evaluation of t
he corresponding Witten diagrams which is in contrast to the usual method
using Mellin space techniques. We will conclude by comparing both methods.
This talk is partially based on [JHEP 02 (2021) 151][1]\n\n\n [1]: https
://doi.org/10.1007/JHEP02(2021)151\nhttps://indico.desy.de/event/26540/con
tributions/110063/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110063/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holographic defect correlators from (almost) thin air
DTSTART;VALUE=DATE-TIME:20210921T073500Z
DTEND;VALUE=DATE-TIME:20210921T075500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110064@indico.desy.de
DESCRIPTION:Speakers: Aleix Gimenez-Grau (DESY)\, Julien Barrat (Humboldt-
Universität zu Berlin)\, Pedro Liendo Cordova (T (Stringtheory))\nThe AdS
/CFT duality provides a correspondence between correlation functions at we
ak coupling on the gravity side and at strong coupling for its field theor
y counterpart. However correlation functions are notably hard to compute i
n this regime\, and I report on how modern analytical bootstrap methods ca
n be used in order to derive defect two-point functions up to next-to-lead
ing order\, by using minimal input from supergravity. I will specifically
show how to obtain the correlator of two chiral primary operators in the p
resence of a Wilson-line defect in $\\mathcal{N}=4$ SYM.\nhttps://indico.d
esy.de/event/26540/contributions/110064/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110064/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Standard Model EFTs and On-Shell Techniques
DTSTART;VALUE=DATE-TIME:20210924T081500Z
DTEND;VALUE=DATE-TIME:20210924T083000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110067@indico.desy.de
DESCRIPTION:Speakers: Manuel Accettulli Huber (Queen Mary University of Lo
ndon)\, Stefano De Angelis (Queen Mary University of London)\nI will revie
w the Standard Model Effective Field Theories (SMEFT) from purely on-shell
arguments. Starting from few basics assumptions such as Poincaré invaria
nce and locality\, it is possible to classify all the renormalizable and n
on-renormalizable interactions at the lowest order in the couplings. From
these building blocks\, locality and unitarity enforce Lie algebra structu
res to appear in the S-matrix elements together with relations among coupl
ings (and hypercharges). Furthermore\, on-shell techniques allowed us to c
ompute any higher-point amplitude (or form factor) in generic EFTs. Finall
y\, using known amplitudes techniques I will show the computation of the m
ixing matrix of SMEFT marginal interactions up to mass dimension 8\, to li
near order in the effective interactions.\nhttps://indico.desy.de/event/26
540/contributions/110067/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110067/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The anomaly that was not meant IIB
DTSTART;VALUE=DATE-TIME:20210922T124000Z
DTEND;VALUE=DATE-TIME:20210922T130000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110083@indico.desy.de
DESCRIPTION:Speakers: Miguel Montero (Harvard)\nType IIB supergravity famo
usly has a discrete duality group\,\nwhich is an exact symmetry of the ful
l type IIB string theory. This\nsymmetry has potential quantum anomalies\,
which could render the theory\ninconsistent. In this talk I will describe
how we computed these\nanomalies in recent work\, and show they are nonva
nishing\, but\nremarkably\, they can be cancelled by a subtle modification
of the IIB\nChern-Simons term in what amounts to a new variant of the Gre
en-Schwarz\nmechanism. This can only happen because of some "miraculous\nc
ancellations" that depend on the details of the IIB supergravity\nspectrum
. I will also describe alternative ways to cancel this anomaly\,\npresenti
ng variant versions of IIB string theory which have the same IIB\nsupergra
vity as the low-energy limit\, but which differ at the\nnonperturbative le
vel. These theories may or may not be in the\nSwampland.\nhttps://indico.d
esy.de/event/26540/contributions/110083/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110083/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Correlators from unitarity in 1D CFT
DTSTART;VALUE=DATE-TIME:20210921T094500Z
DTEND;VALUE=DATE-TIME:20210921T100000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110085@indico.desy.de
DESCRIPTION:Speakers: Davide Bonomi (London City College)\nIn this brief t
alk I will show how to compute the CFT data and the four-point function in
1D CFTs from unitarity. First I will review the OPE inversion formula\, w
hich allows to recover the spectrum and OPE coefficients from the double d
iscontinuity of a Regge bounded four-point function. Then I will explain h
ow to use it to find the CFT data in a perturbative expansion around Gener
alized Free Field theory. In particular\, I will focus on the computation
of the contact diagram in theory up to one loop.\nhttps://indico.desy.de/
event/26540/contributions/110085/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110085/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards Celestial Holography
DTSTART;VALUE=DATE-TIME:20210924T071500Z
DTEND;VALUE=DATE-TIME:20210924T073500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110086@indico.desy.de
DESCRIPTION:Speakers: Laura Donnay (Vienna)\nUniversal relationships betwe
en asymptotic symmetries\, QFT soft theorems\, and low energy observables
have reinvigorated attempts at formulating a holographic correspondence fo
r flat spacetimes. In this talk\, I will review recent advances in the ce
lestial holography proposal\, where the 4d S-matrix is reconsidered as a 2
d correlator on the celestial sphere at null infinity.\nhttps://indico.des
y.de/event/26540/contributions/110086/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110086/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Double Descent and Contrastive Learning
DTSTART;VALUE=DATE-TIME:20210921T082000Z
DTEND;VALUE=DATE-TIME:20210921T083500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110084@indico.desy.de
DESCRIPTION:Speakers: Veronica Guidetti (T (Cosmology))\nN/A\nhttps://indi
co.desy.de/event/26540/contributions/110084/
LOCATION:Seminar room 4 (a+b)
URL:https://indico.desy.de/event/26540/contributions/110084/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Melting cosmic strings and gravitational waves
DTSTART;VALUE=DATE-TIME:20210923T083000Z
DTEND;VALUE=DATE-TIME:20210923T084500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110105@indico.desy.de
DESCRIPTION:Speakers: Sabir Ramazanov\nAppearance of cosmic strings in the
early Universe is a common manifestation of new physics typically linked
to some high energy scale. In this talk\, I will discuss a different situa
tion\, where a model underlying cosmic string formation is approximately s
cale free. String tension is naturally related to the square of the temper
ature of the hot primordial plasma in such a setting\, and hence decreases
with (cosmic) time. With gravitational backreaction neglected\, the dynam
ics of these melting strings in an expanding Universe is equivalent to the
dynamics of constant tension strings in a Minkowski spacetime. I will pro
vide an estimate for the emission of gravitational waves from string loops
. Contrary to the standard case\, the resulting spectrum is markedly non-f
lat and has a characteristic falloff at frequencies below the peak one. Th
e peak frequency is defined by the underlying model and lies in the range
accessible by the future detectors for very weak couplings involved.\nhttp
s://indico.desy.de/event/26540/contributions/110105/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110105/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Opening up the axion dark matter window with axion fragmentation
DTSTART;VALUE=DATE-TIME:20210922T120000Z
DTEND;VALUE=DATE-TIME:20210922T121500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110106@indico.desy.de
DESCRIPTION:Speakers: Philip Soerensen (UNI/TH (Uni Hamburg\, Institut fue
r Theoretische Physik))\, Cem Eröncel (DESY)\, Geraldine Servant (T (Cosm
ology))\, Ryosuke Sato (T (Cosmology))\nFragmentation of the axion field m
ay produce the observed DM abundance\, which makes it possible for ALP DM
to appear with lower values of the axion decay constant than those allowed
by the conventional misalignment mechanism. Previously\, kinetic misalign
ment has been proposed to open up this parameter space. We find that for a
large range of parameters the field becomes fragmented before kinetic mis
alignment can take place. Additionally\, we demonstrate how the initial ve
locity necessary for fragmentation can be delivered and study how the proc
ess may be constrained or tested via cosmological observables such as BBN
and structure formation.\nhttps://indico.desy.de/event/26540/contributions
/110106/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110106/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dark Matter from Exponential Growth
DTSTART;VALUE=DATE-TIME:20210922T131500Z
DTEND;VALUE=DATE-TIME:20210922T133000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110108@indico.desy.de
DESCRIPTION:Speakers: Marco Hufnagel (ULB)\, Torsten Bringmann (Oslo Unive
rsity)\, Frederik Depta (T (Phenomenology))\, Kai Schmidt-Hoberg (DESY)\,
Joshua Ruderman\nWe propose a novel mechanism for the production of dark m
atter (DM) from a thermal bath\, based on the idea that DM particles $\\ch
i$ can transform heat bath particles $\\psi$: $\\chi \\psi \\rightarrow \
\chi \\chi$. For a small initial abundance of $\\chi$ this leads to an e
xponential growth of the DM number density\, in close analogy to other fam
iliar exponential growth processes in nature. We demonstrate that this mec
hanism complements freeze-in and freeze-out production in a generic way\,
opening new parameter space to explain the observed DM abundance\, and we
discuss observational prospects for such scenarios.\nhttps://indico.desy.d
e/event/26540/contributions/110108/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110108/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Neutron-antineutron oscillation as a probe of baryogenesis
DTSTART;VALUE=DATE-TIME:20210924T080500Z
DTEND;VALUE=DATE-TIME:20210924T082000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110107@indico.desy.de
DESCRIPTION:Speakers: Chandan Hati (Technische Universität München\, Jam
es-Franck-Straße 1\, D-85748 Garching\, Germany)\, Kåre Fridell (Technic
al University of Munich)\, Julia Harz (Technical University of Munich (TUM
))\nNeutron-antineutron ($n$\\-$\\bar{n}$) oscillation is a baryon number
violating process that will be probed at an unprecedented sensitivity in n
ear future experiments at ESS and DUNE. We study potential impacts of the
$n$\\-$\\bar{n}$ oscillation mechanism on the baryon asymmetry of the Univ
erse. Using an effective field theory framework\, as well as a simplified
model for one of two possible UV-complete topologies of the $n$\\-$\\bar{n
}$ operator\, we connect a potential $n$\\-$\\bar{n}$ oscillation discover
y to baryogenesis\, and show the overlap with resonant production at the L
HC. We find that successful baryogenesis can be realised in regions of par
ameter space that are currently unexplored but will be probed by future $n
$\\-$\\bar{n}$ oscillation experiments.\nhttps://indico.desy.de/event/2654
0/contributions/110107/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110107/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Primordial gravitational waves revealed by a spinning axion
DTSTART;VALUE=DATE-TIME:20210921T093000Z
DTEND;VALUE=DATE-TIME:20210921T094500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110111@indico.desy.de
DESCRIPTION:Speakers: Yann Gouttenoire (not set)\, Geraldine Servant (T (C
osmology))\, Peera Simakachorn (UNI/TH (Uni Hamburg\, Institut fuer Theore
tische Physik))\nA fast-spinning axion can dominate the Universe at early
times and generates the so-called kination era. The presence of kination i
mprints a smoking-gun spectral enhancement in the primordial gravitational
wave (GW) background. Current and future-planned GW observatories could c
onstrain particle theories that generate the kination phase. Surprisingly\
, the viable parameter space allows for a kination era at the PeV-EeV scal
e and generates a peaked spectrum of GW from either cosmic strings or prim
ordial inflation\, which lies inside ET and CE windows.\nhttps://indico.de
sy.de/event/26540/contributions/110111/
URL:https://indico.desy.de/event/26540/contributions/110111/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Islands in Multiverse Models
DTSTART;VALUE=DATE-TIME:20210922T141500Z
DTEND;VALUE=DATE-TIME:20210922T143000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110114@indico.desy.de
DESCRIPTION:Speakers: Aidan Chatwin-Davies (U. of British Columbia\; KU Le
uven)\, Thomas Hertog (KU Leuven)\, Sergio Ernesto Aguilar Gutierrez (KU L
euven)\, Brandon Robinson (KU Leuven)\, Natalia Pinzani-Fokeeva (MIT\; Flo
rence U)\nWe consider multiverse models in two-dimensional linear dilaton-
gravity theories as toy models of false vacuum eternal inflation. Coupling
conformal matter we calculate the Von Neumann entropy of subregions. When
these are sufficiently large we find that an island develops covering mos
t of the rest of the multiverse\, leading to a Page-like transition. This
resonates with a description of multiverse models in semiclassical quantum
cosmology\, where a measure for local predictions is given by saddle poin
t geometries which coarse-grain over any structure associated with eternal
inflation beyond one's patch.\nhttps://indico.desy.de/event/26540/contrib
utions/110114/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110114/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bubble wall velocities in local thermal equilibrium
DTSTART;VALUE=DATE-TIME:20210923T071500Z
DTEND;VALUE=DATE-TIME:20210923T073000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110110@indico.desy.de
DESCRIPTION:Speakers: Carlos Tamarit (Technische Universität München)\,
Wen-Yuan Ai\, Björn Garbrecht (Technische Universität München)\nThe bub
ble wall velocity in first-order cosmological phase transitions is crucial
for phenomenological studies of\, for example\, the production of stochas
tic gravitational waves and electroweak baryogenesis. It is commonly expec
ted that a friction force on the bubble wall can only arise from out-of-eq
uilibrium effects. Here we study the bubble wall motion in local thermal e
quilibrium. We resolve some apparent contradictions in the calculations an
d their interpretation and show that the recently proposed effective frict
ion in local equilibrium originates from inhomogeneous temperature distrib
utions. Further\, we propose a new matching condition from local entropy c
onservation. With this\, we are able to determine the bubble velocities in
local equilibrium numerically.\nhttps://indico.desy.de/event/26540/contri
butions/110110/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110110/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Production of Thermal Axions in the Early Universe
DTSTART;VALUE=DATE-TIME:20210921T082000Z
DTEND;VALUE=DATE-TIME:20210921T083500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110118@indico.desy.de
DESCRIPTION:Speakers: Francesco D'Eramo (University of Padova\, INFN)\, Se
okhoon Yun (University of Padova\, INFN)\, Fazlollah Hajkarim (University
of Padova\, INFN)\nWe study the thermal production of axions over differen
t scales especially around the QCD and electroweak phase transitions in th
e early universe. We focus on the most motivated axion models (KSVZ and DF
SZ) and investigate how the thermal history can influence on the productio
n rate of hot axion as dark radiation. This can lead to predictions for th
e future measurements of the cosmic microwave background by experiments li
ke CMB-S4.\nhttps://indico.desy.de/event/26540/contributions/110118/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110118/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cosmic Birefringence Triggered by Dark Matter Domination
DTSTART;VALUE=DATE-TIME:20210922T123000Z
DTEND;VALUE=DATE-TIME:20210922T124500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110119@indico.desy.de
DESCRIPTION:Speakers: Fuminobu Takahashi (Tohoku University)\, Shota Nakag
awa (Tohoku University)\, Masaki Yamada (Tohoku University)\nRecently\, th
e Planck 2018 polarization data of cosmic microwave background (CMB) radia
tion suggested the non-zero rotation angle of CMB polarization plane $\\be
ta=0.35\\pm0.14 {\\rm deg}$\, which is called cosmic birefringence. Cosmic
birefringence is predicted if an axion-like particle (ALP) moves after th
e recombination. We show that this naturally happens if the ALP is coupled
to the dark matter density because it then acquires a large effective mas
s after the matter-radiation equality. Our scenario applies to a broad ran
ge of the ALP mass\, even smaller than the present Hubble constant. We giv
e a simple model to realize this scenario where dark matter is made of hid
den monopoles which give the ALP such a large effective mass through the W
itten effect. The mechanism works if the ALP decay constant is of order th
e GUT scale without a fine-tuning of the initial misalignment angle.\nhttp
s://indico.desy.de/event/26540/contributions/110119/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110119/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Small Field Polynomial Inflation
DTSTART;VALUE=DATE-TIME:20210922T144500Z
DTEND;VALUE=DATE-TIME:20210922T150000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110117@indico.desy.de
DESCRIPTION:Speakers: Yong Xu (Bethe Center for Theoretical Physics\, Univ
ersität Bonn)\, Manuel Drees (University of Bonn)\nIn this talk\, we will
present a renormalizable polynomial inflation model\, focusing on the sma
ll field scenario. We show that the CMB data can be fitted perfectly with
a perturbated inflection-point. In particular\, the running of the spectra
l index is predicted to be $\\alpha \\simeq -1.43 \\times 10^{-3}$\, which
could be tested by next generation CMB experiment. We also analyze rehea
ting through perturbative inflaton decays to either fermionic or bosonic f
inal states via a trilinear coupling. We obtain a full parameter space by
considering BBN constraint on reheating temperature and radiative stabili
ty of the inflaton potential. We find that the inflationary scale within
the parameter space can be as low as $H_{\\rm inf} \\sim 1$ MeV\, or as hi
gh as $\\sim 10^{10}$ GeV. Similarly\, the reheating temperature can lie b
etween its lower bound of $\\sim 4$ MeV and about $4 \\times 10^8 \\ (10^{
11})$ GeV for fermionic (bosonic) inflaton decays. Our model is renormali
zable and very simple\, and can thus serve as the inflationary sector of s
ome well motivated BSM scenarios.\nhttps://indico.desy.de/event/26540/cont
ributions/110117/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110117/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Listening to hot dark sector phase transitions
DTSTART;VALUE=DATE-TIME:20210922T150000Z
DTEND;VALUE=DATE-TIME:20210922T151500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110124@indico.desy.de
DESCRIPTION:Speakers: Carlo Tasillo (RWTH Aachen University)\, Felix Kahlh
oefer (RWTH Aachen University)\, Fatih Ertas (RWTH Aachen)\nThe observatio
n of stochastic gravitational wave backgrounds from first-order phase tran
sitions in the early Universe is promising to become a feasible test for h
igh energy physics. In this talk\, I will show how observable signals can
be obtained from strong first-order phase transitions in a dark sector. If
the dark sector is initially without thermal contact to the particle spec
ies of the Standard Model (SM)\, it can possibly have a higher temperature
than the SM bath during the phase transition which will\, in turn result
in more energy being emitted in the form of gravitational radiation. Howev
er\, the resulting signals will be diluted by the entropy injected into th
e SM bath when the dark sector decays. To illustrate these competing effec
ts\, I will consider a U(1) extension to the SM that allows for a phase tr
ansition testable with LISA and the Einstein Telescope.\nhttps://indico.de
sy.de/event/26540/contributions/110124/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110124/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fractional Dark Energy
DTSTART;VALUE=DATE-TIME:20210923T080000Z
DTEND;VALUE=DATE-TIME:20210923T081500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110123@indico.desy.de
DESCRIPTION:Speakers: Ricardo Landim (Techinical University of Munich)\nT
he fractional dark energy (FDE) model describes the accelerated expansion
of the Universe through a non-relativistic gas of particles with a non-can
onical kinetic term. This term is proportional to the absolute value of th
e three-momentum to the power of 3w\, where w is simply the dark energy eq
uation of state parameter\, and the corresponding energy leads to an energ
y density that mimics the cosmological constant. This inverse momentum ope
rator appears in fractional quantum mechanics and it is the inverse of the
Riesz fractional derivative. The observed vacuum energy can be obtained t
hrough the integral of the Fermi-Dirac (or Bose-Einstein) distribution and
the lowest allowed energy of the particles. Furthermore\, a system of FDE
particles may present negative absolute temperatures (NAT). NAT are possi
ble in quantum systems and in cosmology\, if there exists an upper bound o
n the energy. This maximum energy is one ingredient of the FDE model and i
ndicates a connection between FDE and NAT\, if FDE is composed of fermions
. In this scenario\, the equation of state parameter is equal to minus one
and the transition from positive to negative temperatures could happen in
the early Universe.\nhttps://indico.desy.de/event/26540/contributions/110
123/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110123/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gravitational wave echo of relaxion trapping
DTSTART;VALUE=DATE-TIME:20210921T080500Z
DTEND;VALUE=DATE-TIME:20210921T082000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110122@indico.desy.de
DESCRIPTION:Speakers: Abhishek Banerjee (Weizmann Institute of Science)\,
Gilad Perez (Weizmann Institute of Science)\, Wolfram Ratzinger (Johannes
Gutenberg University Mainz)\, Eric Madge (Weizmann Institute of Science)\,
Pedro Schwaller (University of Mainz)\nTo solve the hierarchy problem\, t
he relaxion must remain trapped in the correct minimum\, even if the elect
roweak symmetry is restored after reheating. In this scenario\, the relaxi
on starts rolling again until the backreaction potential\, with its set of
local minima\, reappears. Depending on the time of barrier reappearance\,
Hubble friction alone may be insufficient to retrap the relaxion in a lar
ge portion of the parameter space. Thus\, an additional source of friction
is required\, which might be provided by coupling to a dark photon. The d
ark photon experiences a tachyonic instability as the relaxion rolls\, whi
ch slows down the relaxion by backreacting to its motion\, and efficiently
creates anisotropies in the dark photon energy-momentum tensor\, sourcing
gravitational waves. We calculate the spectrum of the resulting gravitati
onal wave background from this new mechanism\, and evaluate its observabil
ity by current and future experiments. We further investigate the possibil
ity that the coherently oscillating relaxion constitutes dark matter and p
resent the corresponding constraints from gravitational waves.\nhttps://in
dico.desy.de/event/26540/contributions/110122/
URL:https://indico.desy.de/event/26540/contributions/110122/
END:VEVENT
BEGIN:VEVENT
SUMMARY:High-redshift cosmology with intensity mapping
DTSTART;VALUE=DATE-TIME:20210923T093500Z
DTEND;VALUE=DATE-TIME:20210923T095000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110121@indico.desy.de
DESCRIPTION:Speakers: Caroline Samantha Heneka (not set)\nIntensity Mappin
g (IM) of line emission targets the Universe from present\ntime up to reds
hifts beyond ten when the Universe reionized and the first\ngalaxies forme
d\, from small to largest scales. Similar to CMB measurements\,\nthe power
spectra of intensity fluctuations inform about the underlying cosmology\;
\nimagine the information encoded in thousands of intensity maps at\ndiffe
rent redshifts and for multiple emission lines\, forming full tomographic\
nlightcones. In this talk I review IM as a test for cosmology and fundamen
tal\nphysics during cosmic dawn and the epoch of reionization. I show how
power\nand cross-power spectra as well as global temperature measurements
probe\nour cosmology\, properties of dark matter and of astrophysical sour
ces. The\nmeasurement of deviations from the gravitational constant G and
a possible\ndark matter – dark energy coupling are highlighted in genera
l modified gravity\nscenarios. The ability of upcoming instruments like th
e SKA to constrain\nthese modifications is demonstrated. If time permits\,
going beyond ’traditional’ summary statistics\, I furthermore show ho
w neural networks are able to directly\ninfer e.g. dark matter and astroph
ysical properties from such tomographic\nline fluctuation lightcones witho
ut an underlying Gaussian assumption.\nhttps://indico.desy.de/event/26540/
contributions/110121/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110121/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Direct detection of light dark matter from evaporating primordial
black holes
DTSTART;VALUE=DATE-TIME:20210922T130000Z
DTEND;VALUE=DATE-TIME:20210922T131500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110126@indico.desy.de
DESCRIPTION:Speakers: Ninetta Saviano (INFN)\, Marco Chianese (University
of Naples\, Federico II)\, Roberta Calabrese (University of Naples Federic
o II)\, Damiano Francesco Giuseppe Fiorillo (University of Naples "Federic
o II")\nThe direct detection of sub-GeV dark matter interacting with nucle
ons is hampered by the low recoil energies induced by scatterings in the d
etectors. This experimental difficulty is avoided in the scenario of boost
ed dark matter where a component of dark matter particles is endowed with
large kinetic energies. In this Letter\, we point out that the current eva
poration of primordial black holes with masses from $10^{14}$ to $10^{16}$
g is a source of boosted light dark matter with energies of tens to hundr
eds of MeV. Focusing on the XENON1T experiment\, we show that these relati
vistic dark matter particles could give rise to a signal orders of magnitu
de larger than the present upper bounds. Therefore\, we are able to signif
icantly constrain the combined parameter space of primordial black holes a
nd sub-GeV dark matter. In the presence of primordial black holes with a m
ass of $10^{15}~\\mathrm{g}$ and an abundance compatible with present boun
ds\, the limits on DM-nucleon cross-section are improved by four orders of
magnitude.\nhttps://indico.desy.de/event/26540/contributions/110126/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110126/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dark Matter and Electroweak Phase Transition in the Inert Doublet
Model
DTSTART;VALUE=DATE-TIME:20210922T140000Z
DTEND;VALUE=DATE-TIME:20210922T141500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110130@indico.desy.de
DESCRIPTION:Speakers: Yun Jiang (MOE Key Laboratory of TianQin Mission\, T
ianQin Research Center for Gravitational Physics & School of Physics and A
stronomy\, Frontiers Science Center for TianQin\, CNSA Research Center for
Gravitational Waves\, Sun Yat-sen University)\, Florian Goertz (MPIK)\, S
ven Fabian (Max-Planck-Institut für Kernphysik)\nIn this talk\, we will p
rovide a comprehensive analysis of the prospect to realize Dark Matter (DM
) and to enhance the Electroweak PhaseTransition (EWPhT) with an Inert Dou
blet. Taking the latest constraints from collider physics and direct-detec
tion experiments into account\, we will investigate the possibility of a s
trong first-order EWPhT via one or two steps in combination with a signifi
cant amount of the measured DM abundance both in the low-mass and in the h
igh-mass regime\, exploring also new regions of parameter space. We will f
ind that the low-mass regime leads to a parameter space providing a signif
icant DM abundance as well as to a strong first-order EWPhT without or wit
h an intermediate stage during the EWPhT. On the contrary\, the high-mass
regime gives rise either to a significant amount of DM or to a strong firs
t-order EWPhT\, the latter being an integral part of EW baryogenesis to ex
plain the present baryon-antibaryon asymmetry.\nhttps://indico.desy.de/eve
nt/26540/contributions/110130/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110130/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Primordial Black Hole Dark Matter evaporating on the Neutrino Floo
r
DTSTART;VALUE=DATE-TIME:20210923T073000Z
DTEND;VALUE=DATE-TIME:20210923T074500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110127@indico.desy.de
DESCRIPTION:Speakers: stefano morisi (na)\, Damiano Francesco Giuseppe Fio
rillo (University of Naples "Federico II")\, Gennaro Miele\, Roberta Calab
rese (Università degli studi di Napoli "Federico II")\, Antonio Palazzo\n
Primordial black holes hypothetically generated in the first instants of l
ife of the Universe are potential dark matter candidates. Focusing on prim
ordial black holes masses in the range $[5 \\times 10^{14} − 5\\times 10
^{15}]$g\, we point out that the neutrinos emitted by primordial black hol
es evaporation can interact through the coherent elastic neutrino-nucleus
scattering producing an observable signal in multi-ton dark matter direct
detection experiments. We show that with the high exposures envisaged for
the next-generation facilities\, it will be possible to set bounds on the
fraction of dark matter composed by Primordial black holes improving the e
xisting neutrino limits obtained with Super-Kamiokande. We also quantify t
o what extent a signal originating from a small fraction of dark matter in
the form of primordial black holes would modify the so-called “neutrino
floor”\, the well-known barrier towards detection of weakly interacting
massive particles as the dominant dark matter component.\nhttps://indico.
desy.de/event/26540/contributions/110127/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110127/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Easing the sigma8-tension with neutrino-DM interactions
DTSTART;VALUE=DATE-TIME:20210923T095000Z
DTEND;VALUE=DATE-TIME:20210923T100500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110128@indico.desy.de
DESCRIPTION:Speakers: Markus Mosbech (The University of Sydney)\nThe $\\si
gma_8$-tension of Planck data with weak lensing and redshift surveys is on
e of the main problems with the $\\Lambda$CDM model of cosmology. We show
that the tension can be alleviated by introducing an interaction between d
ark matter and neutrinos. We model the interaction using a linear Boltzman
n treatment\, introducing a novel implementation that for the first time u
ses the full massive neutrino hierarchy. We also provide upper limits on t
he interaction cross-section between neutrinos and dark matter.\n\nBased o
n arXiv:2011.04206\nhttps://indico.desy.de/event/26540/contributions/11012
8/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110128/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Absorption from Primordial Black Holes as source of baryon asymmet
ry
DTSTART;VALUE=DATE-TIME:20210924T073500Z
DTEND;VALUE=DATE-TIME:20210924T075000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110129@indico.desy.de
DESCRIPTION:Speakers: Roberta Calabrese (University of Naples "Federico II
")\, Stefano Morisi (University of Naples "Federico II")\, Damiano F. G. F
iorillo (University of Naples "Federico II")\, Antonio Ambrosone (Universi
ty of Naples "Federico II")\, Gennaro Miele (University of Naples "Federic
o II")\nWe propose a new mechanism for baryogenesis\, in which baryon asym
metry is generated by absorption of a new particle $X$ carrying baryon num
ber onto Primordial Black Holes (PBHs). Due to CP violation of $X$ and $\\
overline{X}$ scattering with the plasma surrounding PBHs\, the two conjuga
te particles are differently absorbed by PBHs\, leading to the production
of an asymmetry in the $X$ sector. The production is halted by PBH evapora
tion\, after which the asymmetry is transferred into the baryonic sector v
ia $X$ decay. We show that this mechanism can produce the correct amount o
f asymmetry without violating the known constraints on PBHs concentration.
Furthermore\, we provide a systematic study of the parameter space\, iden
tifying the regions leading to the production of the correct baryon asymme
try\nhttps://indico.desy.de/event/26540/contributions/110129/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110129/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The Hypersimplex VS the Amplituhedron via T-Duality
DTSTART;VALUE=DATE-TIME:20210922T142000Z
DTEND;VALUE=DATE-TIME:20210922T144000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110061@indico.desy.de
DESCRIPTION:Speakers: Matteo Parisi (University of Oxford)\, Melissa Sherm
an-Bennett (University of Michigan)\, Lauren Williams (Harvard University
)\nThis work is about a duality between two seemingly unrelated objects. T
he *hypersimplex* $\\Delta_{k+1\,n}$ -- a polytope of dimension $n-1$ in $
\\mathbb{R}^n$ -- has been the center of attention of both mathematicians
and physicists\, in connection with the moment map\, torus orbits in the G
rassmannian\, tropical geometry and cluster algebras. Meanwhile\, the *amp
lituhedron* $\\mathcal{A}_{n\,k\,2}$ -- a full-dimensional subset of the G
rassmannian $\\mbox{Gr}_{k\,k+2}$ (not a polytope!) -- was introduced by A
.Hamed and Trnka in the context of the physics of *scattering amplitudes*
in $\\mathcal{N}=4$ super Yang-Mills theory (SYM). Surprisingly\, as was f
irst discovered in the work by Lukowski-Parisi-Williams [LPW]\, these two
objects are closely related by a combinatorial-geometric incarnation of *T
-duality* from String Theory\, responsible for the Amplitudes/Wilson loops
duality in $\\mathcal{N}=4$ SYM. \nIn this work\, exploiting T-duality\,
we both draw new striking connections between $\\Delta_{k+1\,n}$ and $\\ma
thcal{A}_{n\,k\,2}$ and discover new properties of them. We show that ineq
ualities cutting out *positroid polytopes* -- images of positroid cells in
the hypersimplex -- translate into sign conditions characterizing the T-d
ual *Grasstopes* -- images of positroid cells in the amplituhedron. Moreov
er\, we subdivide the amplituhedron into *chambers*\, just as the hypersim
plex can be subdivided into simplices - both enumerated by the Eulerian nu
mbers\, and related by T-duality. We use these properties to prove the mai
n conjecture of [LPW]: a collection of positroid polytopes triangulates th
e hypersimplex if and only if the collection of T-dual Grasstopes triangul
ates the amplituhedron. As corollaries\, some class of nice triangulations
can be obtained from *BCFW recursions* and the *positive tropical Grassma
nnian* $\\mbox{Trop}^+\\mbox{Gr}_{k+1\,n}$ -- both central in computations
of scattering amplitudes.\nAlong the way\, we also prove several more con
jectures: Arkani-Hamed--Thomas--Trnka's conjecture that $\\mathcal{A}_{n\,
k\,2}$ can be characterized using sign-flips\, Lukowski--Parisi--Spradlin-
-Volovich's conjectures about *generalized triangles* (Grasstopes in a tri
angulation of $\\mathcal{A}_{n\,k\,2}$)\, and (a generalization of) $m=2$
*cluster adjacency*. Finally\, we discover novel cluster-algebraic structu
res in the amplituhedron -- motivated by finding a geometric origin to *cl
uster phenomena* appearing in $\\mathcal{N}=4$ SYM\, and beyond.\n\nThis i
s based on joint work with M. Sherman-Bennett and L. K. Williams (Preprint
\, arXiv: 2104.08254).\nhttps://indico.desy.de/event/26540/contributions/1
10061/
LOCATION:Seminar room 2
URL:https://indico.desy.de/event/26540/contributions/110061/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Calculation of the solar axion flux and the KSVZ axion model lands
cape
DTSTART;VALUE=DATE-TIME:20210921T090000Z
DTEND;VALUE=DATE-TIME:20210921T091500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110120@indico.desy.de
DESCRIPTION:Speakers: Lennert Thormaehlen (Institute for Theoretical Physi
cs Heidelberg)\, Joerg Jaeckel (ITP Heidelberg)\, Vaisakh Plakkot (Georg-A
ugust-Universität Göttingen)\, Sebastian Hoof (Georg-August-Universität
Göttingen)\nThe calculation of the solar axion flux has recently generat
ed much attention\, and it has been realised that axions can be powerful t
ools for studying solar metal abundances and magnetic fields.\n\nThe feasi
bility of such studies depends on our ability to accurately predict the so
lar axion flux. In this talk\, I will present an overview of solar models
and opacity codes and summarise the statistical and systematic uncertainti
es of the solar axion flux calculation from Primakoff\, ABC\, and plasmon
interactions. I will discuss how previous calculations can be improved fur
ther e.g. by including electron degeneracy effects.\n\nAs a direct applica
tion\, IAXO's ability to distinguish KSVZ axion benchmark models its prosp
ects to tackle the solar abundance problem will be discussed. I will also
comment on the broader landscape of KSVZ models and our recent efforts to
catalogue them.\nhttps://indico.desy.de/event/26540/contributions/110120/
URL:https://indico.desy.de/event/26540/contributions/110120/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dark Photon and CMB data in our inhomogeneous universe
DTSTART;VALUE=DATE-TIME:20210921T073000Z
DTEND;VALUE=DATE-TIME:20210921T075000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110181@indico.desy.de
DESCRIPTION:Speakers: Andrea Caputo (Tel Aviv University and Weizmann Inst
itute)\n...\nhttps://indico.desy.de/event/26540/contributions/110181/
URL:https://indico.desy.de/event/26540/contributions/110181/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Reshuffled SIMP Dark Matter
DTSTART;VALUE=DATE-TIME:20210922T124500Z
DTEND;VALUE=DATE-TIME:20210922T130000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110113@indico.desy.de
DESCRIPTION:Speakers: Pyungwon Ko (Korea Inst for Advanced Study (KIAS))\,
Chih-Ting Lu (Korea Institute for Advanced Study)\, Shu-Yu Ho (Korea Ins
titute for Advanced Study)\nIn this talk\, we reanalyze the multi-componen
t strongly interacting massive particle (mSIMP) scenario using an effectiv
e operator approach. As in the single-component SIMP case\, the total reli
c abundance of mSIMP dark matter (DM) is determined by the coupling streng
ths of $3 \\to 2$ processes achieved by a five-point effective operator. I
ntriguingly\, we find that there is an unavoidable $2 \\to 2$ process indu
ced by the corresponding five-point interaction in the dark sector\, which
would reshuffle the mass densities of SIMP DM after the chemical freeze-o
ut. We dub this DM scenario as reshuffled SIMP (rSIMP). Given this observa
tion\, we then numerically solve the coupled Boltzmann equations including
the $3 \\to 2$ and $2 \\to 2$ processes to get the correct yields of rSIM
P DM. It turns out that the masses of rSIMP DM must be nearly degenerate f
or them to contribute sizable abundances. On the other hand\, we also intr
oduce effective operators to bridge the dark sector and visible sector via
a vector portal coupling. Since the signal strength of detecting DM is pr
oportional to the individual densities\, thereby\, obtaining the right amo
unt of DM particles is crucial in the rSIMP scenario. The cosmological and
theoretical constraints for rSIMP models are discussed as well.\nhttps://
indico.desy.de/event/26540/contributions/110113/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110113/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Supernova bounds on axion-like particles coupled with nucleons and
electrons
DTSTART;VALUE=DATE-TIME:20210922T121500Z
DTEND;VALUE=DATE-TIME:20210922T123000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110115@indico.desy.de
DESCRIPTION:Speakers: Pierluca Carenza (Università degli Studi di Bari)\,
Maurizio Giannotti (Barry University)\, Jaeckel Joerg (Institut fur theor
etische Physik\, Universitat Heidelberg)\, Alessandro Mirizzi (University
of Bari)\, Francesca Calore (CNRS\, LAPTh)\, Giuseppe Lucente (University
of Bari\, INFN Bari)\nWe investigate the potential of type II supernovae (
SNe) to constrain axion-like particles (ALPs) coupled simultaneously to nu
cleons and electrons. ALPs coupled to nucleons can be efficiently produced
in the SN core via nucleon-nucleon bremsstrahlung and\, for a wide range
of parameters\, leave the SN unhindered\, producing a large ALP flux.\nFor
masses exceeding 1 MeV\, these ALPs would decay into electron-positron pa
irs\, generating a positron flux. In the case of Galactic SNe\, the annihi
lation of the created positrons with the electrons present in the Galaxy w
ould contribute to the 511 keV annihilation line. Using the SPI (SPectrome
ter on INTEGRAL) observation of this line\, allows us to exclude a wide ra
nge of the axion-electron coupling\, $10^{-19} \nhttps://indico.desy.de/ev
ent/26540/contributions/110115/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110115/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Primordial black holes in an early matter-dominated era and stocha
stic inflation
DTSTART;VALUE=DATE-TIME:20210922T143000Z
DTEND;VALUE=DATE-TIME:20210922T144500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110116@indico.desy.de
DESCRIPTION:Speakers: Julian Rey (IFT-UAM)\nWe consider the possibility th
at the majority of dark matter in our Universe consists of black holes of
primordial origin. We examine the effects of stochastic inflation and an e
arly matter-dominated era on the abundance of these black holes. We show t
hat the power spectrum of comoving curvature perturbations computed in sto
chastic inflation matches the result obtained by solving the Mukhanov-Sasa
ki equation at the linear level\, even in the presence of an ultra-slow-ro
ll phase. We also find a significant reduction in the required tuning of t
he parameters of the inflationary potential in the matter-dominated scenar
io\, in contrast to the standard case of formation during radiation domina
tion. We show that the stochastic background of primordial gravitational w
aves resulting from this mechanism could be detected by future space-based
observatories.\nhttps://indico.desy.de/event/26540/contributions/110116/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110116/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Statistical Analysis of the NDW=1 QCD Axion Mass Window from Topol
ogical Defects
DTSTART;VALUE=DATE-TIME:20210921T091500Z
DTEND;VALUE=DATE-TIME:20210921T093000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110131@indico.desy.de
DESCRIPTION:Speakers: Sebastian Hoof (Georg-August-Universität Göttingen
)\, David Marsh (University of Goettingen)\, Jana Riess (Universtiy of Gö
ttingen)\nThis talk would be based on the paper by Sebastian Hoof\, David
J. E. Marsh and myself\, that was uploaded on arXiv recently (https://arxi
v.org/abs/2108.09563).\n\nWe review results from QCD axion string and doma
in wall simulations and propagate the associ-\nated uncertainties into the
calculation of the axion relic density. This allows us to compare differe
nt\nresults in the literature and\, using cosmological constraints\, to pe
rform statistical inference on the\naxion mass window in the post-inflatio
nary Peccei–Quinn symmetry breaking scenario. For dark\nmatter axions\,
this leads to a median dark matter axion mass of 0.50 meV\, while the 95%
cred-\nible interval at highest posterior density is between 0.48 and 0.52
meV. For simulations including\nstring-domain wall decays\, these numbers
are 0.22 meV and [0.16\, 0.27] meV. Relaxing the condition\nthat axions a
re all of the dark matter\, the axion mass window is completed by an upper
bound of\naround 80 meV\, which comes from hot dark matter constraints. T
his demonstrates\, at least from\nthe statistical perspective\, that the a
xion mass can be constrained rather precisely once it is possible\nto over
come the much larger systematic uncertainties.\nhttps://indico.desy.de/eve
nt/26540/contributions/110131/
URL:https://indico.desy.de/event/26540/contributions/110131/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cosmic Birefringence Signal from Axion-Like Dark Matter
DTSTART;VALUE=DATE-TIME:20210921T094500Z
DTEND;VALUE=DATE-TIME:20210921T100000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110109@indico.desy.de
DESCRIPTION:Speakers: Guenter Sigl (University of Hamburg)\, Pranjal Trive
di (University of Hamburg)\nAxion-like particles (ALPs) are leading dark m
atter candidates originally motivated by the strong CP problem and also ar
ise in theories of string compactifications. We present a sensitive probe
for ALPs as ultra-light dark matter - the birefringence in the cosmic micr
owave background (CMB). Birefringence arises from the oscillating ALP fiel
d's inhomogeneity and is also relevant for laboratory axion searches. \nNe
w constraints on the ALP-photon coupling are derived by theoretical treatm
ent of oscillating ALPs across recombination and local observation along w
ith comparison to observations. Our results give orders of magnitude impro
vement over prior constraints (CAST 2017)\, with even further prospects fo
r upcoming cosmological birefringence observations. These limits\, in hith
erto unconstrained regions of the coupling vs. ALP mass parameter-space\,
are independent of assumed magnetic fields and relatively robust to ALP da
rk matter fraction. \nFurthermore\, recent tentative hints of a detection
of cosmic birefringence in the CMB would imply the presence of parity-viol
ating ALPs at specific combinations of ultra-light mass and ALP-photon cou
pling.\nhttps://indico.desy.de/event/26540/contributions/110109/
URL:https://indico.desy.de/event/26540/contributions/110109/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Primordial Black Holes from Confinement
DTSTART;VALUE=DATE-TIME:20210922T151500Z
DTEND;VALUE=DATE-TIME:20210922T153000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110125@indico.desy.de
DESCRIPTION:Speakers: Michael Zantedeschi (Max Planck Institute for Physik
\, Munich)\, Gia Dvali (Max Planck Institute for Physics\, Munich)\, Flori
an Kühnel (LMU\, Munich)\nA mechanism for the formation of primordial bla
ck holes is proposed. Here\, heavy quarks of a confining gauge theory prod
uced by de Sitter fluctuations are pushed apart by inflation and get confi
ned after horizon re-entry. The large amount of energy stored in the QCD s
tring connecting the quark pair leads to black-hole formation. These are m
uch lighter and can be of higher spin than those produced by standard coll
apse of horizon-size inflationary overdensities. Other difficulties exhibi
ted by such mechanisms are also avoided. Phenomenological features of the
new mechanism are discussed as well as accounting for both the entirety of
the dark matter and the super-massive black holes in the galactic centres
. Under proper conditions\, the mechanism can be realised in a generic con
finement theory\, including ordinary QCD. We discuss a possible string-the
oretic realisation via D-branes. Interestingly\, for conservative values o
f the string scale\, the produced gravity waves are within the range of re
cent NANOGrav events. Simple generalisations of the mechanism allow for th
e existence of a significant scalar component of gravity waves with distin
ct observational signatures.\nhttps://indico.desy.de/event/26540/contribut
ions/110125/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110125/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Finding sound shells in LISA mock data
DTSTART;VALUE=DATE-TIME:20210923T081500Z
DTEND;VALUE=DATE-TIME:20210923T083000Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110104@indico.desy.de
DESCRIPTION:Speakers: Jorinde Marjolein van de Vis (T (Cosmology))\, Thoma
s Konstandin (T (Cosmology))\, Felix Giese (T (Cosmology))\nI discuss to w
hat extend LISA can observe features of gravitational wave spectra origina
ting from cosmological first-order phase transitions. I focus on spectra w
hich are of the form of double-broken power laws. These spectra are predic
ted by hydrodynamic simulations and also analytical models such as the sou
nd shell model. I argue that the ratio of the two break frequencies is an
interesting observable since it can be related to the wall velocity while
overall amplitude and frequency range are often degenerate for the numerou
s characteristics of the phase transition. The analysis uses mock data obt
ained from the power spectra predicted by the simplified simulations and t
he sound shell model and analyzes the detection prospects using chi^2 -min
imization and likelihood sampling. I point out that the prospects of obser
ving two break frequencies from the electroweak phase transition is hinder
ed by a shift of the spectrum to smaller frequencies for strong phase tran
sitions.\nhttps://indico.desy.de/event/26540/contributions/110104/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110104/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cosmological tensions: hints for a new concordance model?
DTSTART;VALUE=DATE-TIME:20210923T091500Z
DTEND;VALUE=DATE-TIME:20210923T093500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110183@indico.desy.de
DESCRIPTION:Speakers: Eleonora Di Valentino (Durham University )\nhttps://
indico.desy.de/event/26540/contributions/110183/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110183/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Uniting low-scale leptogenesis mechanisms
DTSTART;VALUE=DATE-TIME:20210924T071500Z
DTEND;VALUE=DATE-TIME:20210924T073500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110184@indico.desy.de
DESCRIPTION:Speakers: Juraj Klaric (É. P. F. de Lausanne)\nhttps://indic
o.desy.de/event/26540/contributions/110184/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110184/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Energy minima as a model for Dark Matter haloes
DTSTART;VALUE=DATE-TIME:20210923T102000Z
DTEND;VALUE=DATE-TIME:20210923T103500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110101@indico.desy.de
DESCRIPTION:Speakers: Ravi Sheth (University of Pennsylvania)\, Marcello M
usso (T (Theorie))\nAnalytical models of structure formation are an import
ant tool\, complementary to N-body simulations\, to investigate the format
ion of Dark Matter structures and the dependence of their statistics on co
smological parameters. They rely on some non-linear map\, typically inferr
ed from spherical collapse\, to relate topological features of the initial
density field (number of maxima\, minima\, saddles\, critical points...)
to different types of structures and events (halos\, voids\, filaments\, m
ergers...) in the cosmic web.\nConventional models are based on the heuris
tic assumption that virialized structures originate from initial regions t
hat are maxima of the smoothed matter density field.\nI will describe how
shifting the focus from the initial density to the initial energy field\,
and characterizing protohalos from the minimization of the energy\, provid
es: 1) a more physically sound model\, 2) a better mathematical behavior\,
and 3) a better description of the location and shape of protohalo patche
s found in N-body simulations.\nhttps://indico.desy.de/event/26540/contrib
utions/110101/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110101/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Concordant approaches to resonant leptogenesis: comparison for a s
calar prototype
DTSTART;VALUE=DATE-TIME:20210924T075000Z
DTEND;VALUE=DATE-TIME:20210924T080500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110112@indico.desy.de
DESCRIPTION:Speakers: Mathias Garny (Desy)\, Peter Millington (University
of Nottingham)\, Björn Garbrecht (Technische Universität München)\, Gio
vanni Zattera (Technical University of Munich)\nIn the recent years\, Lept
ogenesis and Electroweak Baryogenesis have been a developing ground for no
n-equilibrium thermal quantum field theory techniques. In particular\, the
generation of a CP asymmetry can be described in terms of the Schwinger-D
yson (SD) equations evaluated over a closed time path (CTP) in the Schwing
er-Keldysh formalism. Based on this SD approach the equations of motion fo
r the propagators of the theory appear as non-linear integro-differential
equations. A few strategies to reduce these equations into something solva
ble have been developed based on different choices for the representation
of the two arguments of the propagators. The most common approaches use tw
o times (2T) in coordinate space or a hybrid description of momenta and co
ordinates in Wigner space. Although qualitative comparisons for these two
approaches have been made\, a systematic and detailed analysis has never b
een carried out thus far. In this work we perform this inspection for the
first time using a simple scalar model\, with particular focus on flavour
mixing and oscillations of the fields corresponding to sterile neutrinos.
We find that\, when aiming for the leading accuracy in the produced CP asy
mmetry\, these approaches are in agreement across the whole mass-parameter
space ranging from the extremely degenerate mass spectrum to the hierarch
ical regime. To achieve this\, we upgrade the state of the art for the Wig
ner space solutions and provide a comprehensive description that is valid
for all possible mass spectra.\nhttps://indico.desy.de/event/26540/contrib
utions/110112/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110112/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Beyond freeze-in: Dark Matter via Inverse Phase Transition and Gra
vitational Waves
DTSTART;VALUE=DATE-TIME:20210924T082000Z
DTEND;VALUE=DATE-TIME:20210924T083500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110272@indico.desy.de
DESCRIPTION:Speakers: Alexander Vikman\nI will discuss a recently proposed
class of models where Dark Matter (DM) is produced via an inverse phase t
ransition. The inverse phase transition can be caused by coupling to some
cosmological field. For instance\, this field can be the Ricci scalar\, as
in e-Print: 2004.03410\; primordial magnetic field\, as in e-Print: 2010.
03383\; or thermal fluctuations of other fields\, as in e-Print: 2104.1372
2. In this most recent work we proposed a novel scenario of DM production
tidy connected with generation of gravitational waves. DM is modelled as a
real scalar\, which interacts with the hot primordial plasma through a po
rtal coupling to another scalar field. For a particular sign of the coupli
ng\, this system exhibits an inverse phase transition. The latter leads to
an abundant DM production\, even if the portal interaction is so weak tha
t the freeze-in mechanism is inefficient. The model predicts domain wall f
ormation in the early Universe\, long before the inverse phase transition.
These domain walls have a tension decreasing with time\, and completely d
isappear at the inverse phase transition\, so that the problem of overclos
ing the Universe is avoided. The domain wall network emits gravitational w
aves with characteristics defined by those of DM. In particular\, the peak
frequency of gravitational waves is determined by the portal coupling con
stant\, and falls in the observable range for currently planned gravitatio
nal wave detectors.\nhttps://indico.desy.de/event/26540/contributions/1102
72/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110272/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dark Sector Spectroscopy at Neutrino Telescopes with Quantum-Gravi
tational Decoherence
DTSTART;VALUE=DATE-TIME:20210922T153000Z
DTEND;VALUE=DATE-TIME:20210922T154500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110278@indico.desy.de
DESCRIPTION:Speakers: Dominik Hellmann (TU Dortmund)\, Heinrich Paes (TU D
ortmund)\, Erika Rani (TU Dortmund)\nWe discuss the interplay of wave pack
age decoherence and decoherence induced by quantum gravity via interaction
s with spacetime foam for high energy astrophysical neutrinos. In this con
text we point out a compelling consequence of the expectation that quantum
gravity should break global symmetries\, namely that quantum-gravity indu
ced decoherence can provide both a powerful tool for the search for new pa
rticles\, including totally decoupled backgrounds interacting only gravita
tionally\, and at the same time a window into the intricacies of black hol
e information processing.\nhttps://indico.desy.de/event/26540/contribution
s/110278/
LOCATION:Main Auditorium
URL:https://indico.desy.de/event/26540/contributions/110278/
END:VEVENT
BEGIN:VEVENT
SUMMARY:SuperWimp Baryogenesis in MSSM
DTSTART;VALUE=DATE-TIME:20210921T100000Z
DTEND;VALUE=DATE-TIME:20210921T101500Z
DTSTAMP;VALUE=DATE-TIME:20220127T142300Z
UID:indico-contribution-110223@indico.desy.de
DESCRIPTION:Speakers: Laura Covi (University of Goettingen)\, Sarif Khan (
Goettingen University)\, Giorgio Arcadi (University of Rome 3)\nIn this wo
rk\, we have studied the production of baryon asymmetry and gravitino dark
matter in contemporary times from the decay of the same source. In accomp
lishing a physical model to study these phenomenologies we have considered
R-parity violating SUSY and the decay of Bino like neutralino which gener
ates the baryon asymmetry and DM. In continuation of the previous work\, w
e have added here the up squark contribution in addition to the down squar
k contribution in the present work. Moreover\, we have also considered mix
ing cases among down or up squarks or in both the sectors with the most ge
neral complex mixing matrix having complex phases as well. Due to the pres
ence of the complex phases in the mixing matrices besides bino and gluino
phases\, it can generate more asymmetry than the previous work. We have sh
own that we can lower the Bino and consequently the Gluino mass which can
be accessed at the current collider setup at LHC. In addition to collider
detection\, we can access the model parameter space\, which generates the
correct value of the baryon asymmetry and DM abundance\, in the near futur
e at the neutron anti-neutron oscillation experiments by determining the o
scillation time.\nhttps://indico.desy.de/event/26540/contributions/110223/
URL:https://indico.desy.de/event/26540/contributions/110223/
END:VEVENT
END:VCALENDAR