Martin Luescher
27/09/2016, 14:50
The Yang-Mills gradient flow provides new insight into the dynamics of non-Abelian gauge theories and has become a widely used tool in lattice QCD. In this talk, the theoretical foundation of the flow is reviewed and some of its applications are briefly described.
Vasily Pestun
28/09/2016, 09:10
I will review the gauge theoretical construction of quantum algebras such as q-deformed W-algebras and quantum groups from the geometry of the moduli space of quiver instantons, moduli space of monopoles and moduli space of vacua of N=2 supersymmetric gauge theories.
Kyriakos Papadodimas
28/09/2016, 10:30
I will review some exact results about the coupling constant dependence of the chiral ring in four dimensional N=2 theories.
Nathan Seiberg
28/09/2016, 12:20
Combining insights from different branches of physics we will present a rich set of dualities in 2+1 dimensions
Jonas Lindert
(Zurich University)
28/09/2016, 14:00
Particle Phenomenology
Evgeny Skvortsov
28/09/2016, 14:00
String & Mathematical Physics
We study the higher-spin gauge theory in six-dimensional anti-de Sitter space AdS6 that is based on the exceptional Lie superalgebra F(4). The relevant higher-spin algebra was constructed in arXiv:1409.2185 [hep-th]. We determine the spectrum of the theory and show that it contains the physical fields of the Romans F(4) gauged supergravity. The full spectrum consists of an infinite tower of...
Dr
Alexander Merle
(Max-Planck-Institut für Physik)
28/09/2016, 14:00
Cosmology & Astroparticle Physics
In the absence of a clear WIMP signal, we should think about alternative candidates for Dark Matter. A very well motivated example is a (up to now hypothetical) sterile neutrino with a mass of a few keV. In this talk, I will give an overview over the topic of keV sterile neutrino Dark Matter, with a particular focus on Dark Matter production in the early Universe and on phenomenological...
Dr
Maikel de Vries
(JGU Mainz)
28/09/2016, 14:00
Particle Phenomenology
The coannihilation mechanism plays a crucial role in determining the DM relic abundance in a plethora of new physics models. Recently, a general classification of simplified models for this mechanism has been presented in the Coannihilation codex. In particular, the thermal relic abundance of a pure Standard Model singlet DM candidate can naturally be explained by coannihilation with a new...
Dr
Sebatien Clesse
(RWTH Aachen University)
28/09/2016, 14:15
Cosmology & Astroparticle Physics
The recent detection by Advanced LIGO of gravitational waves (GW) from the merging of a binary black hole system sets new limits on the merging rates of massive primordial black holes (PBH) that could be identified to the dark matter in the Universe. If PBH are regrouped in clusters with a similar density to the one observed in ultra-faint dwarf galaxies, merging rates are comparable to...
Jan Heisig
(RWTH Aachen University)
28/09/2016, 14:20
Particle Phenomenology
Dr
Dmitri Bykov
(Max-Planck-Institut fur Gravitationsphysik)
28/09/2016, 14:20
String & Mathematical Physics
We construct zero-curvature representations for the equations of motion of a class of sigma-models with complex homogeneous target spaces, not necessarily symmetric. We show that in the symmetric case the proposed flat connection is gauge-equivalent to the conventional one.
Lorenzo Tancredi
(KIT Karlsruhe)
28/09/2016, 14:20
Particle Phenomenology
We will report on the recent calculation of the NLO QCD corrections to vector boson pair production in gluon fusion, focussing in particular on its interference with the Higgs signal. In particular, as it was shown by Caola and Melnikov, assessing the impact of the interference on the signal and background cross sections in the high energy tail (i.e. for an off-shell Higgs) is crucial to put...
Dr
Stefano Stefano Camera
(Jodrell Bank Centre for Astrophysics, The University of Manchester)
28/09/2016, 14:30
Cosmology & Astroparticle Physics
A tremendous experimental effort is underway with the goal of delivering the first non- gravitational detection of dark matter (DM). Indeed, despite its huge abundance, very little is known about the true nature of DM, and the community is eager for new and innovative ideas able to finally pin down its properties. In this talk, I shall review how cross-correlations of astrophysical and...
Kechen Wang
(DESY)
28/09/2016, 14:40
Particle Phenomenology
Simone Lionetti
(ETH Zurich)
28/09/2016, 14:40
Particle Phenomenology
Jochen Zahn
(Universität Leipzig)
28/09/2016, 14:40
String & Mathematical Physics
In the sense of perturbation theory around arbitrary classical solutions, the Nambu-Goto (NG) string can be consistently quantised as an effective theory for any dimension $D$ of the target space [Comm. Math. Phys. 327 (2014) 779, with D. Bahns & K. Rejzner]. In this framework, we compute semi-classical corrections to the energy of rotating NG strings, using the locally covariant...
Dr
Camilo Alfredo Garcia Cely
(ULB)
28/09/2016, 14:45
Cosmology & Astroparticle Physics
The observation of line-like signals of high-energy gamma rays is considered a discovery channel of dark matter.
Nevertheless, calculating the rate and the spectral shape associated to these processes is highly non-trivial and depends on the details of the underlying dark matter model.
I will argue that, in spite of this situation, there are a number of model-independent statements that...
Paul Moch
(Theoretische Physik 1 Elementarteilchenphysik Uni Siegen)
28/09/2016, 15:00
Particle Phenomenology
Combining Pati-Salam (PS) and flavour symmetries in a renormalisable setup,
we devise a scenario which produces realistic masses for the charged
leptons. Flavour-symmetry breaking scalar fields in the adjoint
representations of the PS gauge group are responsible for generating different
flavour structures for up- and down-type quarks as well as for leptons.
The model is characterised by...
Dr
Andrzej Hryczuk
(University of Oslo)
28/09/2016, 15:00
Cosmology & Astroparticle Physics
In recent years there has been an increasing interest in computations of the dark matter thermal relic density beyond the leading order in perturbation theory. In this talk we point out that the standard calculation, based on solving the Boltzmann equations, at NLO suffers from a temperature-dependent IR divergence. In an example model we show how both soft and collinear temperature-dependent...
Burkhard Eden
28/09/2016, 15:00
String & Mathematical Physics
Three-point functions of generic gauge invariant composite operators in N=4 SYM are very hard to construct in higher-order weak-coupling perturbation theory. On the other hand, three-point functions of half-BPS operators are non-renormalised, and guided by symmetry principles the integrands for their four-point functions can be constructed to high loop order at least in the planar theory. We...
Francesco Knechtli
(Univ. Wuppertal)
28/09/2016, 15:00
Particle Phenomenology
We present a non-perturbative study of a five-dimensional Gauge-Higgs Unification model on the lattice using Monte Carlo simulations.
We find a region in the Higgs phase where the ratio of the Higgs to the gauge boson mass is like in the Standard Model. In the same region we observe localization to four dimensions. Despite the non existence of a second order phase transition, cut-off effects...
Andreas Rappelt
(Technische Universität München)
28/09/2016, 15:15
Cosmology & Astroparticle Physics
In this work, we develop a method to compare results from various direct detection experiments without making assumptions on the velocity distribution of the dark matter particles in the Solar System. Furthermore, we consider the particular case when one of the experiments reports a positive signal, and we apply our method to investigate the compatibility of the DAMA claim with the null...
Mr
Severin Lüst
(Universität Hamburg)
28/09/2016, 15:20
String & Mathematical Physics
We study maximally supersymmetric solutions of all gauged or deformed supergravity theories in D≥3 space-time dimensions. For vanishing background fluxes the space-time background has to be either Minkowski or anti-de Sitter. We derive a simple criterion for the existence of solutions with non-trivial fluxes and determine all supergravities that satisfy it. We show that their solutions...
Tania Robens
(TU Dresden)
28/09/2016, 15:20
Particle Phenomenology
Nayara Fonseca
(DESY)
28/09/2016, 15:20
Particle Phenomenology
Relaxion models are an interesting new avenue to explain the radiative stability of the Standard Model scalar sector. They require very large field excursions, which are difficult to generate in a consistent UV completion and to reconcile with the compact field space of the relaxion. We propose an N-site model which naturally generates the large decay constant needed to address these issues....
Dr
Christian Gross
(Helsinki University)
28/09/2016, 15:30
Cosmology & Astroparticle Physics
Simple single component WIMP Dark Matter (DM) models are under pressure from direct detection (DD). This is related to the relation between annihilation- and DD cross-section in such models. By contrast, multicomponent WIMP DM models leave open a large part of the parameter space and allow for a very rich phenomenology. We study these issues using the example of a UV complete framework...
Paul-Konstantin Oehlmann
(DESY)
28/09/2016, 15:35
String & Mathematical Physics
We give further evidence that genus-one fibers with multi-sections are mirror dual to fibers with Mordell-Weil torsion. In the physics of F-theory compactifications this implies a relation between models with a non-simply connected gauge group and those with discrete symmetries. We explicitly check this observation for torus fibers in two and three dimensional ambient spaces whereas the...
Mr
Juraj Klarić
(Technical University Munich)
28/09/2016, 16:15
Cosmology & Astroparticle Physics
The extension of the Standard Model by heavy right-handed neutrinos can simultaneously explain the observed neutrino masses via the seesaw mechanism and the baryon asymmetry of the Universe via leptogenesis. If the mass of the heavy neutrinos is below the electroweak scale, they may be found at LHCb, BELLE II, the proposed SHiP experiment or a future high-energy collider. In this mass range,...
Dr
Irene Valenzuela
(MPI, Munich)
28/09/2016, 16:15
String & Mathematical Physics
Axion monodromy is a promising proposal to achieve a transplanckian field range for an axion in string theory. These models are better described in terms of a Minkowski 3-form field which couples linearly to the axion, in the Kaloper-Sorbo fashion. We highlight the differences between this simple effective theory and the structure actually obtained from string theory. We show that all the RR...
Dr
Adam Kardos
(University of Debrecen)
28/09/2016, 16:15
Particle Phenomenology
In my talk I introduce the ColorFulNNLO method to calculate NNLO QCD
corrections to any IR-safe observable in the case of three-jet production
in electron-positron annihilation. Provided the ColorFulNNLO method is
general it was implemented in a computer code called MCCSM (Monte Carlo
for the ColorFulNNLO Subtraction Method). The capabilities of the code are
demonstrated by calculating...
Dr
Viviana Niro
(IFT UAM/CSIS and UAM)
28/09/2016, 16:30
Cosmology & Astroparticle Physics
In this talk, I'll show how updated information from gamma-rays experiments constrain the spectrum of the galactic sources previously detected by the Milagro collaboration.
I'll show the number of through-going muons expected from these sources at the IceCube detector and I'll discuss the statistical significance of each source as a function of the detector running time.
Moreover, I'll...
Andreas van Hameren
(IFJ PAN)
28/09/2016, 16:35
Particle Phenomenology
We present a phenomenological study of 4-jet production, calculated
within high-energy factorization, including both contributions from
single-parton and double-parton scattering. High-energy
factorization causes a momentum inbalance in the final state,
allowing for the description of observables at tree-level that would
require next-to-leading order precision in collinear...
Mr
Pietro Longhi
(Uppsala University)
28/09/2016, 16:35
String & Mathematical Physics
New relations between wall crossing invariants, such as the BPS monodromy, and various limits of superconformal indices of 4d N=2 theories have been recently proposed. For theories of class S on their Coulomb branches, spectral networks provide a way to compute BPS monodromies directly, in a neighborhood of the superconformal point. Several new results on BPS monodromies can be obtained in...
Dr
Iason Baldes
(DESY)
28/09/2016, 16:45
Cosmology & Astroparticle Physics
If the Standard Model Yukawa couplings varied in the early universe and started with order one values before electroweak symmetry breaking, the CP violation associated with the CKM matrix could be the origin of the matter-antimatter asymmetry. The large effective Yukawa couplings which lead to the enhanced CP violation can also help in achieving a strong first-order electroweak phase...
Dr
Diego Regalado
(MPP Munich)
28/09/2016, 16:55
String & Mathematical Physics
I will describe a class of four dimensional field theories constructed by quotienting ordinary N=4 U(N) SYM by particular combinations of R-symmetry and SL(2,Z) automorphisms. These theories appear naturally on the worldvolume of D3 branes probing terminal singularities in F-theory, where they can be thought of as non-perturbative generalizations of the O3 plane. I will focus on cases...
Maria Vittoria Garzelli
(Hamburg University)
28/09/2016, 16:55
Particle Phenomenology
Mr
Rasmus Rasmussen
(DESY)
28/09/2016, 17:00
Cosmology & Astroparticle Physics
It has been shown that heavy neutral leptons (HNLs) can explain many phenomena seen in Nature such as the neutrino oscillation data, dark matter and the baryon asymmetry. Therefore, alot of theoretical and experimental effort has been put into this subject. I will discuss the parameter space reach of future experiments searching for HNLs at the GeV scale in terms of neutrino mass models with...
Dr
Aswin Balasubramanian
(DESY and Univ of Hamburg)
28/09/2016, 17:15
String & Mathematical Physics
I'll talk about my work with J. Distler (to appear) in which we study a class of 3d N=4 superconformal field theories and their mass deformations. We perform this study by establishing a relation between the geometry of the vacuum moduli spaces of these theories and (a refined version of) the ``Theory of sheets" which is an important subject in Geometric Representation Theory. This realizes...
Mr
Miguel Campos
(Max-Planck-Institut für Kernphysik)
28/09/2016, 17:15
Cosmology & Astroparticle Physics
We determine constraints on sterile neutrino warm dark matter through direct detection experiments, taking XENON100, XENON1T and DARWIN as example. While not competitive with astrophysical constraints from X-ray data, the constraints are the first direct laboratory bounds on sterile neutrino warm dark matter, and will be in some parts of parameter space the strongest limits on keV-scale neutrinos.
Dr
Tomasz Korzec
(Bergische Universität Wuppertal)
28/09/2016, 17:15
Particle Phenomenology
I will present the ALPHA collaboration's latest calculation of the
Lambda parameter of QCD. Our method relies
on experimental inputs of low energy quantities like pseudo-scalar
decay constants only. The scale dependence of a coupling in a finite volume
renormalization scheme is computed non-perturbatively
in lattice QCD over many orders of magnitude
in the energy scale. At high...
Dr
Julia Harz
(ILP / LPTHE Paris)
28/09/2016, 17:30
Cosmology & Astroparticle Physics
Interactions that manifest themselves as lepton number violating processes at low energies in combination with sphaleron transitions typically erase any pre-existing baryon asymmetry of the Universe. We demonstrate in a model independent approach that the observation of neutrinoless double beta decay would impose a stringent constraint on mechanisms of high-scale baryogenesis, including...
Nezhla Aghaei
(DESY)
28/09/2016, 17:30
String & Mathematical Physics
Oleksandr Gituliar
(Institute of Nuclear Physics, Polish Academy of Sciences)
28/09/2016, 17:35
Particle Phenomenology
We review Fuchsia: an open-source tool for constructing epsilon form of differential equations for Feynman master integrals based on the Lee algorithm. We show several examples of its application to various problems in Quantum Field Theory which require virtual and real momenta integration. We discuss current status of the project and possible extensions in the future.
Romuald Janik
29/09/2016, 09:00
In this talk I will give an overview of various developments in integrability within the AdS/CFT correspondence emphasizing novel directions and setups. I will also point out some outstanding questions.
Nima Arkani-Hamed
29/09/2016, 11:30
Mr
Matthias Strohmaier
(University of Regensburg, Theoretical Particle Physics Department)
29/09/2016, 14:00
Particle Phenomenology
Quantum Chromodynamics (QCD) in non-integer d = 4 − 2e space-time dimensions possesses a nontrivial critical point where the theory enjoys exact scale and conformal invariance. As consequence there are three symmetry generators that commute with the renormalization group equation for composite operators.
The resulting constraints allow to reconstruct full evolution kernels in physical...
Mr
Orestis Loukas
(University of Bern)
29/09/2016, 14:00
String & Mathematical Physics
I will introduce the basic concepts of Large-Charge Perturbation Theory (LCPT) in d+1 space-time dimensions.
Given a Quantum Field Theory with a globally conserved charge Q, LCPT aims at providing analytic insight to sectors, which remain inaccessible via ordinary perturbative methods, but where Q is assumed to be large.
To this end, the scalar O(2) model with $\phi^N$ self-interaction will...
René Sondenheimer
(TPI FSU Jena)
29/09/2016, 14:00
Particle Phenomenology
We investigate nonperturbative renormalization group flows of various Higgs-Yukawa models mimicking the Higgs sector of the standard model. We reanalyze the conventional arguments that relate a lower bound for the Higgs mass with vacuum stability in the framework of the functional renormalization group as well as in the light of exact results for the regularized fermion determinant. In both...
Guillermo Ballesteros
(IPhT CEA - Saclay)
29/09/2016, 14:00
Cosmology & Astroparticle Physics
I will describe a minimal extension of the Standard Model of particle physics that accounts for inflation, dark matter, baryogenesis,
the smallness of neutrino masses and solves the strong CP problem, with a new physics scale around ~10^11 GeV.
Wolfgang Gregor Hollik
(DESY)
29/09/2016, 14:15
Cosmology & Astroparticle Physics
The discovery of the Higgs boson puts a severe constraint on the available parameter space in any SUSY model. In the MSSM, a 125 GeV Higgs together with relatively light stops needs a very large stop mixing, therefore large trilinear terms in the scalar potential. Those are known to destabilize the electroweak ground state and induce a true vacuum in association with squark vevs. Previous...
Mr
Wadim Wormsbecher
(Hu Berlin)
29/09/2016, 14:15
String & Mathematical Physics
We investigate the collinear behavior of tree level amplitudes in several theories using their CHY (Cachazo-He-Yuan) representation. We obtain the leading and subleading orders of the adjacent collinear limit and ask the question whether universality is present and how Einstein-Yang-Mills amplitudes emerge by checking specific identities due to Stieberger and Taylor.
Dr
Debasish Banerjee
(Deutsches Elektronen Synchrotron DESY, Zeuthen)
29/09/2016, 14:20
Particle Phenomenology
In the Wilson formulation, lattice gauge theories with compact gauge
group are confining, at least in the strong coupling limit. In addition, the ground state usually preserves discrete symmetries such as translational and charge conjugation symmetry. In this talk, we consider generalized lattice gauge theories: quantum link models and self-adjoint extensions of Wilson-type theories in...
Dr
Sebastian Paßehr
(DESY)
29/09/2016, 14:20
Particle Phenomenology
The discovery of a Higgs-like particle at the LHC has triggered considerable ongoing effort to reveal its nature and properties. The mass of the particle is one of its basic properties; due to the high-precision mass measurement, higher-order calculations are necessary to make competitive predictions. Although with current experimental results the particle could be identified as the Standard...
Dr
Kyohei Mukaida
(Kavli IPMU)
29/09/2016, 14:30
Cosmology & Astroparticle Physics
We revisit the compatibility between chaotic inflation, which provides a natural solution to the initial condition problem, and the metastable electroweak vacuum, which is suggested by the results of the LHC and the current mass measurements of top quark and Higgs boson. It is known that chaotic inflation poses a threat to the stability of the electroweak vacuum because it easily generates...
Dr
Oliver Schlotterer
(AEI Potsdam)
29/09/2016, 14:30
String & Mathematical Physics
In this talk we derive the tree-level S-matrix of the effective theory of
Goldstone bosons known as the non-linear sigma model (NLSM) from
string theory. This novel connection relies on a recent realization of tree-level
open-superstring S-matrix predictions as a double copy of super-Yang--Mills theory
with Z-theory --- the collection of putative scalar effective field theories...
Dr
Christian Schwinn
(RWTH Aachen)
29/09/2016, 14:40
Particle Phenomenology
I discuss the combined resummation of soft and Coulomb-gluon effects for the production of heavy coloured particles at NNLL accuracy, which includes contributions from spin-dependent non-relativistic potentials and so-called annihilation corrections.
I present results for squark and gluino pair production
at the LHC.
Dr
Nikolai Zerf
(ITP University of Heidelberg)
29/09/2016, 14:40
Particle Phenomenology
We present the evaluation of the two-loop ${\cal O}(m_e^2/s)$ contribution to the wide-angle high-energy electron-positron scattering in the double-logarithmic approximation.
The origin and the general structure of the power-suppressed
double logarithmic corrections are discussed.
Maria Archidiacono
(RWTH Aachen University)
29/09/2016, 14:45
Cosmology & Astroparticle Physics
Within the next few years cosmological structure formation will be probed in greater detail than ever before by new and very large surveys, most notably EUCLID and LSST.
While this opens great possibilities for probing for example dark energy and the mass of neutrinos, it also puts very stringent requirements on theoretical calculations of cosmological observables, such as the matter power...
Martin Sprenger
(ETH Zürich)
29/09/2016, 14:50
String & Mathematical Physics
In this talk, I will describe the connection between the high-energy limit of the six-gluon scattering amplitude in N=4 super Yang-Mills theory and a certain class of single-valued polylogarithmic functions.
While the evaluation of the six-gluon amplitude to high loop orders in general kinematics is a very difficult problem, the amplitude in the multi-Regge regime is governed by a...
Daniel Schmeier
(Bonn University)
29/09/2016, 15:00
Particle Phenomenology
Dr
Jiayin Gu
(DESY)
29/09/2016, 15:00
Particle Phenomenology
A light stop with mass almost degenerate with the lightest neutralino has important implications on naturalness and dark matter relic abundance, and is hard to search at colliders. In this paper, we study the potential of searching for such stop particles at the LHC from sbottom decays, focusing on two channels with final states 2l+met and 1b1l+met. We found that, if the lightest sbottom...
Dr
Cora Uhlemann
(Utrecht University)
29/09/2016, 15:00
Cosmology & Astroparticle Physics
We investigate the formation of a dark matter halo using an idea that is rooted in the correspondence between phase space distributions in classical and quantum mechanics. The dynamics of cold dark matter is governed by the Vlasov (or collisionless Boltzmann) equation whose nonlinearity is induced by gravity according to the Poisson equation. Determining the evolution of density and velocity...
Dr
Florian Loebbert
(Humboldt University Berlin)
29/09/2016, 15:10
String & Mathematical Physics
Recently, Wilson loops in strongly coupled AdS/CFT were found to be invariant under a curious one-parameter family of deformations. In this talk we analyze the nonlocal symmetry underlying this observation. We show that it acts as a raising operator on the Yangian charges and generates the spectral parameter of the model. We also speculate about the possibility to extend this symmetry beyond...
Mr
Marco Zatta
(University of Helsinki)
29/09/2016, 15:15
Cosmology & Astroparticle Physics
Current Higgs boson and top quark data favour metastability of our vacuum which raises questions as to why the Universe has chosen an energetically disfavoured state and remained there during the primordial dynamics. In this talk I will point out that allowing a simple Higgs-inflaton coupling can explain why the Higgs ended up in the electroweak vacuum after inflation. I will show that this...
Emanuele A. Bagnaschi
(DESY)
29/09/2016, 15:20
Particle Phenomenology
Suvi-Leena Lehtinen
(DESY)
29/09/2016, 15:20
Particle Phenomenology
Marco Meineri
(EPFL)
29/09/2016, 15:30
String & Mathematical Physics
Rényi entropies, and entanglement entropy in particular, are popular measures of entanglement in quantum theories. We present a holographic method for computing the response of Rényi entropies in conformal field theories to small shape deformations around a flat (or spherical) entangling surface. Our strategy is based on general properties of conformal field theories in the presence of...
Markus Schulze
(HU Berlin)
29/09/2016, 16:05
Particle Phenomenology
Dr
Javier Rubio
(ITP Heidelberg)
29/09/2016, 16:05
Cosmology & Astroparticle Physics
I will describe how the geometrical properties of the target manifold affect the inflationary predictions of two-field scalar-tensor theories invariant under dilatations. The results presented extend the predictions of the Higgs-dilaton model to a full class of theories defined by an underlying principle. In particular, I will show that when the field-derivative space in the Einstein frame is...
Pedro Liendo
(DESY)
29/09/2016, 16:05
String & Mathematical Physics
Dr
Nico Wintergerst
(Stockholm University)
29/09/2016, 16:20
Cosmology & Astroparticle Physics
Black holes possess a wide range of rather peculiar properties, many of them in connection with their ability to process, store and release information. I explore the possibility that the physical origin of these properties is quantum criticality. To this end, I will demonstrate that simple Bose condensates exhibit a plethora of black hole like properties. This includes trapping, baldness,...
Mr
Manfred Kraus
(RWTH Aachen University)
29/09/2016, 16:25
Particle Phenomenology
Top quark physics is entering a precision era with the LHC Run II. A comprehensive study of top quark pair production in association with one hard jet in the di-lepton decay channel is presented for a center-of-mass energy of 13 TeV. The NLO QCD calculation takes into account all resonant and non-resonant and interference contributions for off-shell top quarks, and W and Z bosons. Theoretical...
Dr
Daniela Cadamuro
(Universität Göttingen)
29/09/2016, 16:25
String & Mathematical Physics
In the context of constructing interacting quantum field theories in the operator-algebraic approach, wedge-local fields play an important role. After the work of Lechner to construct factorizing scattering matrix models with scalar S-matrices without bound states, we recently extended this construction to the Z(N)-Ising model and the A_N-1 affine Toda field theories, namely models with a...
Mr
Alexander Gussmann
(Arnold-Sommerfeld-Center, LMU Munich)
29/09/2016, 16:35
Cosmology & Astroparticle Physics
Standard folk-theorem arguments claim that global charges, such as baryon number, cannot be conserved by semiclassical black holes. We argue that the existence of black holes with classical skyrmion hair invalidates these standard arguments. By carefully analyzing the standard arguments based on a Gedankenexperiment in which a black hole
is seemingly-unable to return the baryon number ...
Dr
Lorenzo Bianchi
(Hamburg University)
29/09/2016, 16:45
String & Mathematical Physics
We consider possible discretizations for a gauge-fixed Green-Schwarz action of Type IIB superstring. We use them for measuring the action, from which we extract the cusp anomalous dimension of planar N=4 SYM as derived from AdS/CFT, as well as the mass of the two AdS excitations transverse to the relevant null cusp classical string solution. For both the observables, we find a good agreement...
Jonas Lindert
(Zurich University)
29/09/2016, 16:45
Particle Phenomenology
Ken'ichi Saikawa
(DESY)
29/09/2016, 16:50
Cosmology & Astroparticle Physics
Minimal chaotic models of D-term inflation predicts too large primordial tensor perturbations. Although it can be made consistent with observations utilizing higher order terms in the Kaehler potential, expansion is not controlled in the absence of symmetries. We comprehensively study the conditions of Kaehler potential for D-term plateau-type potentials and discuss its symmetry. They include...
Jacek Wosiek
(Jagellonian University)
29/09/2016, 17:00
String & Mathematical Physics
A positive representation for an arbitrary complex, gaussian weight is derived and used to construct a statistical formulation of gaussian path integrals directly in the Minkowski time. The positivity of Minkowski weights is achieved by doubling the number of real variables. The continuum limit of the new representation exists only if some of the additional couplings tend to infinity and are...
Susanne Westhoff
(Heidelberg University)
29/09/2016, 17:05
Particle Phenomenology
Balt Van Rees
30/09/2016, 09:40
In this talk we will give an overview of recent results obtained from the bootstrap approach to CFTs. We will discuss both analytical and numerical results, including for supersymmetric theories. We identify several promising directions for further research
Luis Fernando Alday
30/09/2016, 10:20
