Dr
Valentyna Mokina
(HEPHY)
03/06/2019, 09:30
Oral
CRESST (Cryogenic Rare Event Search with Superconducting Thermometers) is a direct dark matter search experiment, located at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy, where an overburden of 1400m of rock (3800m water equivalent) provides an efficient reduction of the cosmic radiation background.
In the CRESST experiment, ~24g scintillating $\mathrm{CaWO_4}$ crystals are used as...
Prof.
Jochum van der Bij
(Freiburg university)
03/06/2019, 09:50
Oral
I will present an a priori argument, why a Dirac triplet
should be the dark matter of the universe.
Prof.
Victor Flambaum
(University of New South Wales)
03/06/2019, 10:10
Oral
We investigate effects of axion (pseudoscalar), dilaton (scalar), dark photon (vector) and dark Z (pseudovector) which may be observed in atomic, molecular and solid state experiments.
Interaction with dark matter may lead to the variation of the size of the solid state resonators which may be observed using laser interferometry and resonance frequencies measurements [1].
Dark...
Mr
Danho Ahn
(Institute for Basic Science, Center for Axion and Precision Physics Research, KAIST)
03/06/2019, 10:30
Oral
Maintaining high Q-factor of the superconducting cavity in a strong magnetic field at gigahertz frequencies is a crucial component in a highly sensitive axion detection system and at the same time, a largely unexplored and challenging task. The natural choice of material for the superconducting cavity to be placed in a high magnetic field is a high-temperature superconductor (HTS) with a high...
Prof.
Jörg Pretz
(RWTH Aachen, III. Physikalisches Institut B)
03/06/2019, 11:20
Oral
Plans for the measurement of charged hadron electric dipole moments (EDMs) at storage rings will be presented. These experiments will also allow for searches of oscillating EDMs connected with axion or axion-like particles. Results of a first test run will be discussed.
Spyridon Argyropoulos
(Iowa)
03/06/2019, 11:40
Oral
We present the first constraints from a search for light scalar particles produced in association with $t\bar{t}$ and jet final states using 36 fb$^{-1}$ of data collected at $\sqrt{s}=13$ TeV with the ATLAS detector. The results are interpreted in the context of an Effective Field Theory model of scalar Dark Energy with conformal and disformal couplings. The results provide the most stringent...
Mr
Bernhard Siebenborn
(Karlsruhe Institute of Technology (KIT))
03/06/2019, 12:00
Oral
EDELWEISS is a phased direct Dark Matter search program based on cryogenic high purity Ge mono-crystals. The simultaneous measurement of heat via thermal sensors (NTDs) and ionization allows for discrimination of nuclear and electron recoils. Based on electronic recoils, a search for axions and axion-like particles in the keV mass range can be performed. With an optimized setup of phonon...
Mr
Justin Baier
(Albert-Ludwigs-Universität Freiburg)
03/06/2019, 12:20
Oral
Dark energy poses one of the most intriguing mysteries of our time and so far no experimental efforts could validate any of the existing theories. In 2003 the chameleon, a neutral spinless scalar particle, had been postulated as possible candidate. This particle couples to photons and can be produced in the Sun by the Primakoff effect. The CERN Axion Solar Telescope (CAST) aims to detect these...
Ms
Katharine Kelley
(ICRAR-UWA)
03/06/2019, 12:40
Oral
Next generation telescopes such as the Square Kilometre Array (SKA) present an exciting opportunity for radio astronomy to contribute to the search for dark matter. Using the theory initially set out by Sikivie 1983 we investigate axion conversion in the magnetic fields that pervade spiral galaxies, galaxy clusters and around dense objects such as neutron stars. I will present the strength of...
Prof.
Horst Fischer
(ALU Freiburg, Physikalisches Institut), Prof.
Marc Schumann
(Univertity of Freiburg)
03/06/2019, 14:30
Introductory Remarks
Dr
Rakshya Khatiwada
(Fermilab)
03/06/2019, 14:40
Oral
This talk will give an overview of the cryogenic detector, particularly cold electronics for the most sensitive experiment to probe the QCD axion to date, Axion Dark Matter eXperiment, (ADMX). The detector technology includes a dilution refrigerator operated at 90mK and quantum-noise-limited amplifiers which contribute minimally to the system noise temperature thereby increasing the...
Dr
Julia Vogel
(LLNL)
03/06/2019, 15:00
Oral
More than 80 years after the postulation of dark matter, its nature remains one of the fundamental questions in cosmology waiting to be answered. Axions have taken the spotlight in recent years and are currently one of the leading candidates for the hypothetical, non-baryonic dark matter expected to account for about 25% of the energy density of the Universe. Especially in the light of the...
Prof.
Ariel Zhitnitsky
(University of British Columbia)
03/06/2019, 15:20
Oral
I overview the dark matter model offering a very natural explanation of a number (naively unrelated) problems in cosmology: the observed relation $\Omega_{\rm DM}\sim\Omega_{\rm visible}$, the observed asymmetry between matter and antimatter in the Universe, known as the ``baryogenesis" problem, the so called "Solar Corona Mystery", the ``Primordial Lithium Puzzle" to name just a few....
Dr
Joshua Eby
(Weizmann Institute of Science)
03/06/2019, 15:40
Oral
Light ($m<$ eV) scalar particles, notably axions and relaxions, make interesting dark matter (DM) candidates, not least because they modify substructure within galaxies. Due to high occupation numbers typical of such candidates, it well known that clumps of scalar field known as boson stars can form, supported by a balance of self-gravity against gradient energy. I will briefly review recent...
Dr
Alessandro Mirizzi
(University of Bari)
03/06/2019, 16:30
Oral
In this talk it will be discussed the physics potential of a Galactic supernovae in probing axions and axion-like particles, starting from the lesson of the SN 1987A to current and planned experiments
Prof.
Michael Tobar
(University of Western Australia)
03/06/2019, 16:50
Oral
At UWA we have funded axion detection programs for several mass ranges. The research program includes:
1) The Oscillating Resonant Group AxioN (ORGAN) experiment [1], to search the mass range 0.06 to 0.21 mev using a 14 Tesla magnet, dilution fridge, novel microwave cavity designs [2] and readout systems based on cross correlation to combine more than one cavity [3].
2) Ferromagnetic...
Dr
Ciaran O'HARE
(Universidad de Zaragoza)
03/06/2019, 17:10
Oral
The recent releases of data from the Gaia satellite are transformational for galactic astronomy. The unprecetented accuracy with which stellar positions and velocities can be determined with Gaia means we are getting a fresh understanding of the structure, composition and history of the Milky Way's halo. The new data shows that the Milky Way underwent several major merger events which shaped...
Reyco Henning
(University of North Carolina at Chapel Hill)
03/06/2019, 17:30
Oral
ABRACADABRA is an experiment that searches for axion dark matter (ADM) in the $10^{-14} - 10^{-6}\mathrm{eV}/c^2$ mass range. In ABRACADABRA, ADM couples to the static magnetic field of a toroidal magnet. This coupling induces a small, oscillating magnetic flux in the center of the torus that can be measured by a pickup loop connected to a SQUID current sensor. Both broadband and resonant...
Dr
Woohyun Chung
(IBS/CAPP)
03/06/2019, 17:50
Oral
A couple of years after the first installation of dilution refrigerators, IBS/CAPP has launched a pilot axion cavity experiment, CAPP-PACE, equipped with an 8 T superconducting magnet with 12 cm inner bore to search for microwave axions with a mass around 10 µeV. The experiment utilized a high Q-factor cavity with a piezoelectric frequency tuning system. The total system noise temperature was...
Dr
Carlo Ligi
(INFN - LNF)
03/06/2019, 18:10
Oral
The KLASH (KLoe magnet for Axion SearcH) experiment has been proposed to search for galactic axions with mass between 0.2 and 1 $\mu$eV using a large volume resonant cavity (22 m$^3$), cooled down to 4.5 K and immersed in a 0.6 T magnetic field generated inside the superconducting magnet of the KLOE experiment located at the National Laboratory of Frascati of INFN. In September 2018 INFN...
Mr
William DeRocco
(Stanford University)
04/06/2019, 09:35
Oral
A dark photon is a well-motivated new particle which, as a component of an associated dark sector, could explain dark matter. One strong limit on dark photons arises from excessive cooling of supernovae. We point out that even at couplings where too few dark photons are produced in supernovae to violate the cooling bound, they can be observed directly through their decays. Supernovae produce...
Dr
Xiang Xiao
(UCLA)
04/06/2019, 09:55
Oral
DarkSide utilizes the 39Ar-depleted argon as target and the dual-phase Time Projection Chambers technology to search for WIMP signal. In this talk, I will review the recent results of the DarkSide-50 experiment, currently running at LNGS with 50-kg fiducial mass. I will also present the status of the DarkSide-20k experiment with 20-tonne fiducial mass. Plans for a further step towards a...
Dr
Alexander Millar
(Stockholm University)
04/06/2019, 10:15
Oral
We propose a new strategy to search for dark matter axions using tunable cryogenic plasmas. Unlike current experiments, which repair the mismatch between axion and photon masses via breaking translational invariance (cavity and dielectric haloscopes), a plasma haloscope enables resonant conversion by matching the axion mass to a plasma frequency. A key advantage is that the plasma frequency is...
Dr
Maxim Goryachev
(University of Western Australia)
04/06/2019, 11:05
Oral
Due to its extraordinary precision reaching $10^{-18}$ level, frequency metrology is one of the most sensitive tools used in many tests of fundamental physics such as detection of violations of the Lorentz Invariance and special relativity, drifts of the fine structure constant, etc. In this presentation, we consider how to adopt these tool for axion searches and demonstrate the key...
Mr
Andrea Palessandro
(CP3-Origins)
04/06/2019, 11:25
Oral
Particles in a yet unexplored dark sector with sufficiently large mass and
small gauge coupling may form purely gravitational atoms (quantum gravitational
bound states) with a rich phenomenology. Near-Planckian atoms decay to gravitons immediately after being produced in the very early universe, creating a nearly monochromatic, isotropic and highly energetic gravitational wave signal. If...
Dr
Scott Kravitz
(Lawrence Berkeley National Lab)
04/06/2019, 11:45
Oral
As noble liquid time projection chambers grow in size, it becomes more difficult to maintain sufficiently large drift field and efficient prompt light collection, both of which are important for dark matter detector performance. I will report on first results from two new systems (XeBrA and IBEX) at Lawrence Berkeley National Laboratory, designed for investigations of high voltage and light...
Prof.
Erika Garutti
(University of Hamburg)
04/06/2019, 12:05
Oral
The Axion is the hypothetical low-mass boson predicted by the Peccei-Quinn mechanism solving the strong CP problem. It is naturally also a cold dark matter candidate, thus it could simultaneously solve two major problems of nature. Up to recently, there was no existing experimental effort aiming to detect QCD axions in the mass range around 100 ueV, preferred by models in which the...
Dr
Erik Lentz
(University of Goettingen)
04/06/2019, 12:25
Oral
It was recently shown that axion dark matter, as a highly-correlated Bose fluid, contains extra-classical physics on super-de Broglie and cosmological length scales. The extra-classical physics comes in the form of an exchange-correlation interaction, induced by the constraints of symmetric particle exchange and inter-axion correlations from self-gravitation. Exchange-correlation physics...
Dr
Claudio Gatti
(INFN)
04/06/2019, 12:45
Oral
To account for the dark matter content in our Universe, post-inflationary scenarios predict for the QCD axion a mass in the range ($10-10^3$) $\mu$eV. Searches with haloscope experiments in this mass range require the monitoring of resonant cavity modes with frequency above 5 GHz, where several experimental limitations occur due to linear amplifiers, small volumes, and low quality factors of...
Ken'ichi Saikawa
(Max Planck Institute for Physics)
04/06/2019, 14:15
Poster
Standard Model-Axion-Seesaw-Higgs portal inflation (SMASH) is a minimal extension of the Standard Model that provides a solution to five problems of particle physics and cosmology (inflation, baryon asymmetry, neutrino masses, strong CP problem, and dark matter) in one stroke. An important prediction of this model is the existence of a significant amount of primordial gravitational waves (GWs)...
Dr
Li-Wei Wei
(AEI Hannover)
04/06/2019, 14:20
Poster
Any Light Particle Search (ALPS) is a series of laboratory light-shining-through-a-wall experiments seeking light-weight sub-eV dark matter candidates including the well-motivated axion-like-particles (ALPs). To extend the experiment sensitivity into scientifically interesting parameter space in terms of ALP-photon coupling, in addition to using long dipole magnets from HERA, ALPS-II...
Ms
Wei Wu
(Imperial College London)
04/06/2019, 14:25
Poster
A recent experiment on the Gemini laser facility at the Rutherford Appleton Laboratory collided intense beams of high-energy photons (~500 MeV) with a dense X-ray eld (~1.5 keV) to investigate the final QED process involving photons which has not been directly observed, the Breit-Wheeler process. The BW process has been well studied in QED so we are exploring how to use the results of these...
Mr
Kaan Ozbozduman
(Bogazici University & CERN), Mr
Marios Maroudas
(University of Patras)
04/06/2019, 14:30
Poster
CAST-CAPP detector project is searching for dark matter axions, in the range of 21 to 25μeV, using tunable rectangular microwave cavities installed in the 43mm twin-bore, 9T, CAST dipole magnet. In December 2018, one of the four identical cavities was operated at constant frequency of ~5.40 GHz and obtained 135 hours of preliminary data with ~25 MHz bandwidth. Data processing and analysis...
Dr
David Tanner
(University of Florida)
04/06/2019, 14:35
Poster
An upgrade to the Axion Dark Matter eXperiment (ADMX) will extend its high sensitivity search for QCD axions up to axion masses of 40 $\mu$eV. Axions are especially significant as dark matter if their mass is of order 2--40 $\mu$eV. They would then make up the dark-matter halos of galaxies. These halo axions may be detected by the Sikivie process, by which they decay to photons through the...
Mr
Graeme Flower
(University of Western Australia)
04/06/2019, 14:40
Poster
Ferromagnetic axion haloscopes search for axion dark matter by exploiting their coupling to electrons. We present a new theoretical framework by which such devices can be understood with a Hamiltonian approach using strongly coupled cavity photons, and magnons from a spherical ferrimagnet. Particular focus is put of the operation of these devices in the dispersive regime, which allows these...
Mr
Tobias Schiffer
(Universität Bonn)
04/06/2019, 14:45
Poster
In the scope of the search for axions and axion like particles (Alps) a detector especially built for low energy X-rays based on the GridPix technology was developed at the University of Bonn. The GridPix is a MicroMegas like readout consisting of a pixelized readout ASIC (Timepix) with a perfectly aligned gas amplification stage, which is photolithographically built on top of the ASIC....
Mr
Nicolò Crescini
(University of Padua - INFN-LNL)
04/06/2019, 14:50
Poster
The search of dark matter in the form of Axions, extremely light and weakly interacting particles, can be performed with detectors called haloscopes. These setups usually test the coupling of Axions with photons, but recently ferromagnetic haloscopes have been proposed to probe the interaction of Axions with the electrons of a magnetic material [1].
The QUAX experiment aims at implementing...
Andrew Sonnenschein
(Fermilab)
04/06/2019, 14:55
Poster
Axion haloscopes based on the resonant cavity technique require large and larger arrays of cavities to maintain signal power as frequency increases. For large numbers of cavities, tuning the cavity resonant frequency with mechanical actuators becomes difficult, especially at temperatures below 100 mK. We propose the use of non-linear dielectric crystals such as Strontium Titanate to tune large...
Mr
Stefan Knirck
(Max-Planck-Institute for Physics)
04/06/2019, 15:00
Poster
The MADMAX experiment is aimed to directly detect dark matter axions
with masses between $40\,\mu{\rm eV}$ and $400\,\mu{\rm eV}$ by using
their conversion to photons at boundaries between materials of different
dielectric constants under a strong magnetic field. Combining many such
surfaces, this conversion can be significantly enhanced using
constructive interference and resonances. We...
Mr
Cristian Cogollos
(ICCUB (Institut de Ciències del Cosmos - Universitat de Barcelona))
04/06/2019, 15:05
Poster
New radiopure electronics for the Micromegas detector to be used in the future BabyIAXO helioscope is proposed based on the FEC-Feminos and AGET ASIC from Saclay due to their long tragectory of collaboration and proven functionaly as in CAST experiment. The modular readout will be divided in two stages. The first part of the electronics is composed of 4 Front End Cards (FEC) with one AGET chip...
Mr
Jose María García Barceló
(Universidad Politécnica de Cartagena)
04/06/2019, 15:10
Poster
Progress on the possibilities for implementing frequency tuning and increasing the volume of RADES (*Relic Axion Detector Exploratory Setup*) axion search cavities are described. The cavities works at X-Band and consist of inter-coupled sub-cavities. A first 5 cavity prototype split into two halves has been manufactured and provides a tuning range of 700 MHz by varying the distance of the two...
Dr
Madalin-Mihai Rosu
(Extreme Light Infrastructure - Nuclear Physics)
04/06/2019, 15:15
Poster
Search for sub-eV Dark Matter candidates at E4 (RA5-DM) looking for frequency shifted photons via four-wave mixing in the vacuum caused by stimulated decay of resonantly produced DM when two color lasers are combined and focused into the vacuum at ELI-NP facility
Mr
Kanioar Karan
(Max-Planck-Institut für Gravitationsphysik / Leibniz Universität Hannover)
04/06/2019, 15:20
Poster
The Any Light Particle Search (ALPS II) is a Light-Shining-Through-a-Wall experiment which will use optical cavities to enhance the oscillation of photons into Axion-like particles (ALPs) and vice-versa. We set up a 1-m-prototype table-top experiment to test and develop subsystems for the finale ALPS II experiment. We will give an overview of this experiment and its current status.
Jessica Golm
(CERN)
04/06/2019, 15:25
Poster
Many experiments all over the world search for Axions in different mass ranges. The Relic Axion Detector Experimental Setup (RADES) uses microwave filters as detectors which are in theory able to scan a mass range of 10 to 100 $\mu$eV. A typical RADES filter consists of N sub-cavities coupled by rectangular irises. They are installed at CAST in a bore of a powerful decommissioned LHC 9 T...
Jan schuette-engel
(Uni Hamburg)
04/06/2019, 15:30
Poster
The presence of axions modifies the Maxwell equations. This is exploited by many axion direct detection search experiments. Feasibility studies and optimizations of the experiment require computing the E-fields in 3D. Using finite element methods (FEM) in full 3D this is computationally very expensive and time consuming.
We present two techniques to compute the 3D E-field solutions for open...
Dr
David Tanner
(University of Florida)
04/06/2019, 15:35
Poster
The Any Light Particle Search (ALPS) II is an experiment designed to search for weakly interacting sub-eV particles that couple to photons in the presence of a magnetic field. In order to detect the extremely weak photon fields associated with the existence of such hypothetical particles, the detector employed needs to be sensitive to power levels equivalent to a few photons per week. The ALPS...
Mr
Aleksandr Chatrchyan
(Heidelberg University, Institute for theoretical physics)
04/06/2019, 15:40
Poster
Axion-like particles (ALP) are promising candidates for dark matter, if produced via the misalignment mechanism. In the presence of a monodromy the discrete shift symmetry of ALPs is explicitly broken. This can lead to a rapid growth of fluctuations during the early stages of vacuum realignment, even if the field is initially homogeneous. We describe the production of stochastic gravitational...
Mr
Evgeniy Unzhakov
(Petersburg Nuclear Physics Institute)
04/06/2019, 15:45
Poster
The modern theoretical models of ``invisible'' axion describe its interaction with ordinary matter in terms of effective coupling with nucleons ($g_{AN}$), electrons ($g_{Ae}$) and photons ($g_{A\gamma}$).
Axion coupling to atomic nuclei ($g_{AN}$) makes it possible for axions to be resonantly emitted or absorbed during the nuclear transitions of magnetic-type.
Particular isotopes...
Mr
Arnaud Andrianavalomahefa
(Karlsruhe Institute of Technology)
04/06/2019, 15:50
Poster
The FUNK (Finding $U(1)$s of Novel Kind) experiment was built to search direct
evidences for hidden-photon (HP) dark-matter. We use a $15\,\mathrm{m}^2$ spherical
metallic mirror as a HP-to-photon converter via Maxwellian-like transition.
Signals are expected to come together as single photon events at the radius
point where we mounted a low-noise photomultiplier.
We scanned the whole...
Dr
Harry Desmond
(University of Oxford)
04/06/2019, 17:10
Oral
Fifth forces generically follow from new dynamical fields, and hence are ubiquitous in extensions to the standard model. Broad classes of Lagrangian exhibit "screening mechanisms" which hide the fifth force in high-density environments such as the Milky Way, while keeping it operative on larger scales. I will describe the search for screened fifth forces on the scale of galaxies and their...
Marco Gorghetto
(SISSA)
04/06/2019, 17:30
Oral
If a PQ phase was ever restored after inflation the evolution of the QCD axion field would be dominated by topological defects, such as strings and domain walls. While in this case the relic abundance of axions is in principle completely calculable in terms of the axion mass, in practice no reliable analytic tool is available. I will first review the physics underlying the production and...
Manuel Meyer
(Stanford University)
04/06/2019, 17:50
Oral
The possible interaction of axionlike particles (ALPs) with photons would leave distinctive features in observations of gamma-ray sources. Such features include apparent oscillations in energy spectra, a reduction of the opacity of the Universe to gamma rays, as well as the possibility of a gamma-ray burst from core-collapse supernovae. In this talk I will review the latest results obtained...
Dr
Arne Wickenbrock
(Johannes Gutenberg-Universität)
04/06/2019, 18:10
Oral
The nature of dark matter, the invisible substance making up over 4/5 of the matter in the Universe, is one of the most fundamental mysteries of modern physics.
Ultralight bosons such as axions, axion-like particles or dark photons could make up most of the dark matter.
Couplings between such bosons and nuclear spins may enable their direct detection via nuclear magnetic resonance (NMR)...
Prof.
Laura Baudis
(Universität Zürich)
04/06/2019, 19:30
Das Universum ist nur zu einem kleinen Teil direkt sichtbar. Ein grosser Teil besteht aus Materie, die weder im Sichtbaren, noch im UV-, Gamma-, Infrarot- oder Mikrowellenbereich strahlt. Aus Messungen der Rotationskurven von Galaxien, der Masse von Galaxienhaufen, der Verteilung der grossräumigen Strukturen, des kosmischen Mikrowellenhintergrundes und der Expansionsrate des Universum wissen...
Dr
Clare Burrage
(Dr.)
05/06/2019, 09:35
Oral
The accelerated expansion of the universe motivates a wide class of scalar field theories that modify gravity on large scales. In regions where the weak field limit of General Relativity has been confirmed by experiment, such theories need a screening mechanism to suppress the new force. I will describe how theories with screening mechanisms can be tested in the laboratory, in particular with...
Dr
Luca Scotto Lavina
(CNRS / LPNHE Laboratory)
05/06/2019, 09:55
Oral
The DARWIN experiment is a proposed next-generation dual-phase time
projection chamber which will operate 50 tonnes of xenon. With such a
large target, its low-energy threshold and ultra low background level,
it will be sensible enough to explore the entire experimentally
accessible parameter space for WIMPs above a mass of 5 GeV/c2, as well
as to search for axions and axion-like...
Prof.
Pierre Sikivie
(University of Florida)
05/06/2019, 10:15
Oral
Electromagnetic radiation with angular frequency half the
axion mass stimulates the decay of dark matter axions and
produces an echo, i.e. faint electromagnetic radiation
traveling in the opposite direction. Thus one may search
for axion dark matter by sending out to space a powerful
beam of electromagnetic radiation and listening for its
echo. The method is particularly attractive if...
Mr
A Colijn
(Nikhef)
05/06/2019, 11:05
Oral
The Universe became transparent to neutrino’s approximately 1 second after the Big Bang. These neutrino’s are omnipresent with a density of around 300 cm$^{-3}$. However, they have never been observed since they have cooled down to a temperature of 1.9K, corresponding to an energy of just several 100 µeV. Within the PTOLEMY collaboration we are investigating techniques to observe these...
Ken'ichi Saikawa
(Max Planck Institute for Physics)
05/06/2019, 11:25
Oral
In light of recent developments of experimental approaches on the search for axion dark matter, it is important to clarify what is the typical theoretical prediction for its mass. The prediction for the axion dark matter mass can be obtained by estimating the relic axion abundance, which is given as a function of the Peccei-Quinn scale. However, the estimation of the axion abundance suffers...
Prof.
Matthias Schott
(Uni Mainz)
05/06/2019, 11:45
Oral
FASER, the ForwArd Search ExpeRiment, is a newly approved experiment at the LHC, dedicated to searching for light, extremely weakly-interacting particles during the LHC Run 3. Such particles may be produced in the LHC's high-energy collisions in large numbers in the far-forward region and then travel long distances through concrete and rock without interacting. They may then decay to visible...
Dr
Roberta Volpe
(UCLouvain (Belgium))
05/06/2019, 12:05
Oral
The features of the NA62 experiment at the CERN SPS – high-intensity setup, trigger-system flexibility, high-frequency tracking of beam particles, redundant particle identification, and
ultra-high-efficiency photon vetoes – make NA62 particularly suitable to search for long-lived, weakly-coupled particles within Beyond the Standard Model physics, using kaon and pion decays as well as...
Dr
Michael A. Fedderke
(Stanford University, University of California Berkeley, and LBNL)
05/06/2019, 12:25
Oral
In this talk, I will detail two ways to search for low-mass axion dark matter using cosmic microwave background (CMB) polarization measurements. These appear, in particular, to be some of the most promising ways to directly detect fuzzy dark matter. Axion dark matter causes rotation of the polarization of light passing through it. This gives rise to two novel phenomena in the CMB. First, the...
Dr
IPPEI OBATA
(ICRR, University of Tokyo)
05/06/2019, 12:45
Oral
Axion dark matter differentiates the phase velocities of the circular-polarized photons. In this work, we present a scheme to measure its phase difference by using a linear optical cavity. We applied this scheme to the Fabry-Perot arm of gravitational wave detectors such as aLIGO, CE, and DECIGO. We found that their potential sensitivities to the axion-photon coupling constant, g_{aγ}, can...
Pablo Soler
(ITP Heidelberg)
06/06/2019, 09:00
A series of conjectures have been recently proposed to distinguish effective field theories that can be consistently coupled to quantum gravity from those which cannot. The latter do not arise as low energy limits of string
compactifications and are said to live in the Swampland. In this talk, I will review the formulation and status of some of the Swampland conjectures, in particular the...
Dr
Andrea Molinario
(Gran Sasso Science Institute)
06/06/2019, 09:35
Oral
The XENON project aims at directly detecting dark matter particles through their interaction in a liquid xenon target. The XENON1T detector, a dual phase Time Projection Chamber with 2 t active mass, has operated at Gran Sasso National Laboratory (Italy) from 2016 to 2018. It collected 1 tonne-year exposure with the lowest electronic recoil background ever achieved by a dark matter detector....
Alberto Lusiani
(Scuola Normale Superiore and INFN, sezione di Pisa)
06/06/2019, 09:55
Oral
The Muon g-2 Experiment (E989) at Fermilab has been designed to measure the muon anomalous magnetic moment with a precision of 140 part-per-billion (ppb), reducing by four times today's 540 ppb uncertainty, which is dominated by the BNL E821 collaboration final result. Data-taking has begun in February 2018 and the collaboration aims at producing a preliminary result in 2019, based on a...
Mr
Anton Sokolov
(INR RAS)
06/06/2019, 10:15
Oral
We consider the poorly studied before non-diffusive energy transport solutions to the solar abundance problem. We find the luminous flux change inside the Sun required to reconcile the Standard solar model with helioseismology. An example of a WISP extension of the Standard model is suggested which can alleviate the discrepancies.
Mr
Govinda Adhikari
(Sejong University)
06/06/2019, 11:05
Oral
COSINE-100 is a direct dark matter detection experiment using ~106 kg of low-background NaI(Tl) detectors submerged in a veto counter consisting of 2 tons of liquid scintillator to test the DAMA/LIBRA’s claim of dark matter observation. The physics run of the experiment began in September 2016 with an average background rate of 3.5 counts/keV/kg/day in the energy region between 2–6 keVee. We...
Mr
Emilio Depero
(ETH Zurich)
06/06/2019, 11:25
Oral
NA64 is a fixed target experiment at the CERN SPS aiming at a sensitive search for hidden
sectors. In this talk, we will present our latest results on the search
for a new sub-GeV vector gauge boson (A′) mediated dark matter (χ)
production. The A′, called dark photon, could be generated in the
reaction e−Z→e−ZA′ of 100 GeV electrons dumped against an active target
which is followed by the...
Mr
Yossi Mosbacher
(The Weizamnn Institute of Science)
06/06/2019, 11:45
Oral
With direct searches getting closer and closer to the neutrino floor, the classical WIMP remains as elusive as ever. The low hanging WIMP fruit will eventually be exhausted as the remaining parameter space is excluded. The need for expanding our sensitivity to lower masses is evident. I will present a novel technique for direct detection by measuring defects in crystals with high sensitivity....
Friederike Januschek
(DESY)
06/06/2019, 12:05
Oral
The Any Light Particle Search II (ALPS II) experiment at DESY will look for axion-like particles (ALPs) with low masses ($m<10^{-4}$ eV). ALPS II is a purely laboratory-based experiment, where ALPs could be produced and detected employing the light-shining-through-wall (LSW) technique using infrared photons with a wavelength of 1064 nm. ALPS II utilizes the concept of resonant enhancement on...
Sergio Arguedas Cuendis
(CERN)
06/06/2019, 12:25
Oral
The CERN axion solar telescope (CAST) is well known for its searches of axions coming from the sun using different types of X-ray detectors. However, in recent years the CAST Collaboration has shifted its focus from solar axions to relic axions with two conceptually new detectors:
The Relic Axions Detector Exploratory Setup (RADES) which is based on a microwave filters and tunable microwave...
Dr
Elisa Todarello
(KIT)
06/06/2019, 12:45
Oral
We develop a formalism to help calculate in quantum field theory the departures from the description of a system by classical field equations. We apply the formalism to a homogeneous classical field with attractive contact interactions, to a homogeneous self-gravitating classical field in critical expansion and to an inhomogeneous classical field with repulsive contact interactions.
We show...
Hartmut Abele
(TU Wien)
06/06/2019, 14:30
Oral
This talk focuses on the control and understanding of a gravitationally interacting elementary quantum system using the techniques of resonance spectroscopy. It offers a new way of looking at gravitation at short distances based on quantum interference. The ultra-cold neutron reflects from a mirror in well-defined quantum states in the gravity potential of the earth allowing the application of...
Dr
Loredana Gastaldo
(Kirchhoff-Institut für Physik, Universität Heidelberg)
06/06/2019, 14:50
Oral
In the last decade low temperature metallic magnetic calorimeters have shown to be suitable for a large number of applications thanks to their excellent energy resolution, reliable energy calibration and extremely low intrinsic background. Recently the interest to use these detectors in experiments designed for understanding the nature of Dark Matter have led to the development of new detector...
Prof.
Gray Rybka
(University of Washington)
06/06/2019, 15:10
Oral
We present the results from the second year of operations of the ADMX G2 Axion Dark Matter search. ADMX has continued its search for axions to higher masses, with sensitivity to an axion model with DFSZ coupling where axions make up the bulk of the local dark matter density. ADMX is also sensitive to KSVZ axions that make up even a small fraction of dark matter. In addition to this year's...
Andreas Pargner
(Karlsruhe Insitute of Technology)
06/06/2019, 15:30
Oral
Based on the work published in arXiv: 1903.06194. In collaboration with M. Feix (Univ. Heidelberg), J. Frank (KIT), R. Reischke (IIT, Haifa), B.M. Schaefer (Univ. Heidelberg), T. Schwetz (KIT).
We assume that dark matter is comprised of axion-like particles (ALPs) generated by
the realignment mechanism in the post-inflationary scenario. This leads to isocurvature
fluctuations with an...
Mr
Pierluca Carenza
(University of Bari)
06/06/2019, 15:50
Oral
We perform an updated calculation of the SN axion emissivity via nucleon bremmstrhalung. Using state-of-the-art SN simulations we study the impact of the axion emission on the SN neutrino signal and we update the SN 1987A bound.
Mr
Pablo Quilez
(Universidad Autónoma de Madrid and IFT UAM/CSIC)
06/06/2019, 16:40
Oral
I will review recent attempts to build heavy axion models which solve the strong CP problem while enlarging the parameter space well beyond that of invisible axion models. Next, I will present a recent model of heavy axions: the first axion model solving the strong CP problem with colour unification and massless fermions. The axion scale may be not far from the TeV region which translates to...
Dr
Ohjoon Kwon
(Institute for basic science)
06/06/2019, 17:00
Oral
We, Center for Axion and Precision Physics research (CAPP), introduce a noble method of frequency tuning for the higher mass axion searching cavity using dielectric meta-material. When the dielectric slits are arranged periodically, they become a dielectric meta-material that has an effective dielectric constant which is proportional to the ratio of the period to the gap, that is, we can...
Prof.
Leonid Kuzmin
(Chalmers University of Technology, Gothenburg, Sweden)
06/06/2019, 17:20
Oral
Axions appear in extensions of the Standard Model of particle physics and may be the solution of the Dark Matter in our Universe. Several new experiments are foreseen in the next decade searching them in a wide range of the parameter space. In the mass region from few to several tens of microelectronvolt, detector sensitivity will be limited by the Standard Quantum Limit of linear amplifiers...
Dr
Soroush Shakeri
(Institute for Research in Fundamental Sciences (IPM))
06/06/2019, 17:40
Oral
The main goal of this work is to probe axion or axion-like particles (ALPs) in light-by-light forward scattering process. We consider the polarization effects caused by off-shell axions in the photon-photon scattering process. We show that the circular polarization signal generated in light-by-light scattering in the current/future laser experiments can shed more light on different aspects...
Stepan Kunc
(Technical University of Liberec)
06/06/2019, 18:00
Oral
Vacuum magnetic birefringence is a non-linear electrodynamic effect predicted as a consequence of the formulation of the Euler-Kockel-Heisenberg effective Lagrangian, first proposed in 1935, which takes into account electron-positron fluctuations. A direct laboratory observation of vacuum magnetic birefringence is still lacking today due to its value: ∆n = 4x10e-24 @ B = 1T.
Key ingredients...
Dr
Pranjal Trivedi
(University of Hamburg)
06/06/2019, 18:20
Oral
Axion-like particles (ALPs) are leading dark matter
candidates originally motivated by the strong CP problem and also
arise in theories of string compactifications. I will present a
sensitive probe for ALPs or ultra-light dark matter - the
birefringence in the cosmic microwave background (CMB). Birefringence
arises from the oscillating ALPs' effective refractive index and is
also...
Prof.
Matthias Steinmetz
(Leibniz Institute for Astrophysics Potsdam)
07/06/2019, 09:00
Recent estimates on the mass of the Milky Way, the Andromeda galaxy, and their satellite systems have given considerably smaller total masses than has been anticipated some 15 years ago. This trend was impressively confirmed by the first results of the Gaia mission. I give an overview of the various mass estimates, discuss possible shortcomings of the employed methods, and draw implications...
Dr
Markus Horn
(South Dakota Science and Technology Authority)
07/06/2019, 09:35
Oral
LUX-ZEPLIN (LZ) is a second-generation dark matter direct detection experiment currently under construction at the 4850’-level of the Sanford Underground Research Facility (SURF) in Lead, South Dakota, USA. The experiment utilizes a dual-phase time projection chamber (TPC), containing seven active tons of purified liquid xenon, to search for potential signals from weakly interacting massive...
SungWoo YOUN
(CAPP/IBS)
07/06/2019, 09:55
Oral
The haloscope is one of the most sensitive approaches to the QCD axion physics within the region where the axion is considered as a dark matter candidate. However, the current experimental sensitivities, relying on the lowest fundamental TM010 mode of a cylindrical cavity, is limited to relatively low mass regions. Exploiting higher-order resonant modes would be beneficial because it enables...
Dr
Elisabetta Baracchini
(Gran Sasso Science Institute)
07/06/2019, 10:15
Oral
We are going to discuss the physics reach and the experimental challenges of directional WIMP-like Dark Matter searches, illustrating the concept of the CYGNUS-TPC international collaboration and how the CYGNO effort fits into it. We are going to present the latest R&D results in the field and discuss future short and long term developments of such techniques, also in the context of solar...
Dr
Enrico Nardi
(Istituto Nazionale di Fisica Nucleare)
07/06/2019, 11:05
Oral
Benchmarks in the axion parameter space (couplings to photons, electrons and nucleons versus axion mass, and the viable mass range for axion DM) are provided by the well-known KSVZ and DFSZ axion models. However, recent years have witnessed a burst of theoretical ideas that produced a large landscape of QCD axion models, for which the relation between mass and couplings can differ sizeably...
Ariel Arza
(University of Florida)
07/06/2019, 11:25
Oral
Electromagnetic radiation with angular frequency equal to half the axion mass stimulates the decay of cold dark matter axions and produces an echo, i.e. faint electromagnetic radiation traveling in the opposite direction. We propose to search for axion dark matter by sending out to space a powerful beam of microwave radiation and listening for its echo. We find that this is a promising...
Dr
Alexander Panin
(INR RAS, Moscow)
07/06/2019, 11:45
Oral
The substructures of light bosonic (axion-like) dark matter may condense into compact Bose stars. Peculiar self-interaction potential of the ALPs introduces attraction between particles and causes collapse of large-mass Bose stars. These processes proceed in an unexpected universal way. First, the central part of Bose star approaches a singular density profile due to self-similar infall of...
Dr
Le Hoang Nguyen
(UNiversity of Hamburg)
07/06/2019, 12:05
Oral
The BRASS (Broad-band Radiometric Axion SearcheS) experiment uses a magnetized conversion surface to search for dark matter axions. The pioneering experiment BRASS-6 will use a 6 sqm parabolic dish and an array of permanent magnets arranged in a flat conversion surface together with an M band receiver. The experiment is currently under construction in radio-shielded laboratory space at the...
Dr
Sebastian Lindemann
(Universität Freiburg)
07/06/2019, 12:25
Oral
Two-neutrino double electron capture (2νECEC) is a second-order weak-interaction process with a predicted half-life that surpasses the age of the Universe by many orders of magnitude. Here we report the direct observation of 2νECEC in Xe-124 with the XENON1T dark-matter detector. The significance of the signal is 4.4 standard deviations and the corresponding half-life of $1.8 \times 10^{22}$...
Dr
Francesca Day
(University of Cambridge)
07/06/2019, 12:45
Oral
It is a well-known fact that compact gravitating objects admit bound state configurations for massive bosonic fields. We describe a new class of superradiant instabilities of axion bound states in neutron star magnetospheres. The instability arises from the mixing of axion and photon modes in the magnetic field of the neutron star which extract energy from the rotating magnetosphere. Unlike...
Prof.
Horst Fischer
(ALU Freiburg, Physikalisches Institut), Prof.
Marc Schumann
(Univertity of Freiburg)
07/06/2019, 13:05
Dr
Hugo Terças
(Instituto Superior Técnico, University of Lisbon)
Oral
Axions, the hypothetical particles restoring the charge-parity symmetry in the strong sector of the Standard Model, and one of the most prone candidates for dark matter, are well-known to interact with plasmas. Recently, we have shown that if the plasma dynamically responds to the presence of axions, then a new quasi-particle (the axion plasmon-polariton) can be formed, being at the basis of a...
