Dr
Andrew Spray
(Institute for Basic Science)
17/05/2017, 13:30
Poster
Semi-annihilation is a generic feature of dark matter theories stabilized by symmetries larger than Z2. It contributes to thermal freeze out and cosmic ray signals, but is irrelevant for direct and collider searches. We use an effective operator approach to make the first model-independent study of the associated phenomenology, enumerating all semi-annihilation operators up to dimension 6,...
Kalman Szabo
(Forschungszentrum Juelich)
17/05/2017, 13:30
Poster
We determine the topological susceptibility and the thermodynamical equation of state for temperatures relevant for the axion production in the early Universe. We use lattice QCD with dynamical fermions. We point out several difficulties in these calculations and address them by introducing novel techniques. Assuming the standard QCD axion scenario and no topological defects we obtain a lower...
Mr
Ippei Obata
(Department of Physics, Kyoto University)
17/05/2017, 13:30
Poster
An inflationary universe predicts vacuum fluctuations of space-time, called primordial gravitational waves, whose power spectra have tiny amplitudes and parity-symmetric features. Intriguingly, however, it is known that the axion-gauge coupling, motivated by string theory, could occur the particle production of gauge fields during inflation so that it provides the parity-violated gravitational...
Dr
James "Jim" Boyce
(The College of William & Mary and Jefferson Lab)
17/05/2017, 13:30
Poster
We report the results of studies showing that temperature dependent photo-luminescence is the likely source of unexpected large background rates in afterglow searches for dark sector phenomena. Using this information, we examine the possibility of a room temperature afterglow search that automatically eliminates this background. Finally,
without this background, we discuss a modest search...
Mr
Doyu Lee
(IBS/CAPP, KAIST)
17/05/2017, 13:30
Poster
CAPP at IBS has started an experiment for searching for axions, employing a method suggested by P. Sikivie. I will present the current set up of CAPP’s axion detector, which includes cryogenics with 3He/4He dilution refrigerator that could cool down cavities to 30mK, development of a high Q-factor pure metal cavity with a sapphire tuning rod driven by piezoelectric frequency tuning system, and...
Prof.
Inma Dominguez
(Universidad de Granada)
17/05/2017, 13:30
Poster
In this project we include axions on stellar evolution models, adopting the current stringest constraints for their coupling to photons and electrons. We obtain that the minimum stellar mass of Core Collapse Supernova (CCSN) progenitors is shifted up by nearly 2 Mo.
Although theoretical and observational uncertainties do not allow us to impose reliable constraints to axions properties...
Mr
Saebyeok Ahn
(Korea Advanced Institute of Science and Technology (KAIST), Center for Axion and Precision Physics research (CAPP), Institute for Basic Science (IBS))
17/05/2017, 13:30
Poster
In halo dark matter axion search experiments, microwave cavities are employed to detect signal from the axion-photon conversion. To enhance the conversion power and reduce the noise level, cavities are typically placed in strong magnetic fields at sufficiently low temperatures, respectively. Axion mass is allowed in a broad range (1 ueV ~1 meV), whereas current cavity-based experiments are...
Prof.
Alexander Derbin
(Petersburg Nuclear Physics Institute)
17/05/2017, 13:30
Poster
Measurements of the beta spectra of $^{144}\rm{Ce}$ and $^{144}\rm{Pr}$ are necessary for the successful implementation of a search for neutrino oscillations in a sterile state with artificial antineutrino source $^{144}\rm{Pr}$. The $^{144}\rm{Ce}-^{144}\rm{Pr}$ target with a thickness of about 1 $\mu\rm{g~cm^{-2}}$ is deposited on the Mylar substrate and is covered with 200 Å of...
Ms
Maria Simanovskaia
(UC Berkeley)
17/05/2017, 13:30
The axion is a leading cold dark matter (CDM) candidate and may be detected by its resonant conversion to a monochromatic RF signal in a tunable microwave cavity permeated by a strong magnetic field. The Haloscope At Yale Sensitive To Axion CDM (HAYSTAC) experiment is both a test bed for innovative cavity and amplifier concepts and a data pathfinder for the 5-25 GHz range. This poster will...
Prof.
Reyco Henning
(University of North Carolina at Chapel Hill)
17/05/2017, 13:30
Poster
The MAJORANA DEMONSTRATOR (MJD) is a 44-kg array of low-background germanium detectors of which 30kg is made from detectors enriched to 88% in 76Ge. MJD is operating a mile underground in the Sanford Underground Research Laboratory in Lead, SD. Its main purpose is to search for the neutrinoless double-beta decay of 76Ge and to demonstrate the technical feasibility of a tonne-scale Ge-based...
Prof.
Alexander Derbin
(Petersburg Nuclear Physics Institute), Dr
Valentina Muratova
(Petersburg Nuclear Physics Institute)
17/05/2017, 13:30
Poster
A search for resonant absorption of the solar axion by $^{83}\rm{Kr}$ nuclei is continued with the krypton proportional counter at the Baksan Neutrino Observatory. Such an absorption should lead to the excitation of low-lying nuclear energy level of $^{83}\rm{Kr}$: $A + ^{83}\rm{Kr} \rightarrow ^{83}\rm{Kr}^* \rightarrow ^{83}\rm{Kr} + \gamma~ \rm{(8.41 keV)}$. The obtained model...
Xiaolong Du
(University of Goettingen)
17/05/2017, 13:30
Poster
Using the semi-analytic GALACTICUS code modified for fuzzy dark matter (FDM), we study the statistics of halo substructure in the FDM model. We find that compared to cold dark matter, FDM halos have much less substructure. The compact cores in the center of subhalos are stable with regard to classical tidal stripping, leading to a peak in the subhalo mass function (SHMF) at roughly the mass of...
