Conveners
Plenary short presentations
- Peter Quinn (ICRAR)
Mr
Le Hoang Nguyen
(Uni Hamburg)
21/06/2018, 16:20
Presentation
The microwave cavity experiment WISPDMX is a haloscope type experiment sensitive to hidden photon and possible light dark matter candidates in a wide mass range below 2 $\mu$eV. The flexible broad-band read-out of WISPDMX provides simultaneous sensitivity to multiple resonant modes as well as to off-resonant frequencies corresponding to particle masses as low as $\sim 10^{-12}$ eV. After...
Mr
Jan Schütte-Engel
(Uni Hamburg)
21/06/2018, 16:25
Presentation
Axions are hypothetical particles introduced to solve the strong CP problem of the Standard Model. In addition axions can resolve the dark matter mystery. Axions with masses in the range of a few
tens of µeV up to a few hundreds of µeV are furthermore motivated by the scenario in which the Peccei-Quinn symmetry is broken after inflation.
This motivates the development of new techniques to...
Dr
Soohyung Lee
(IBS/CAPP)
21/06/2018, 16:30
Presentation
Since P. Sikivie had introduced an experimental technique for detection of the axion dark matter with a microwave resonant cavity, a number of experiments have attempted to search for it using this haloscope technique in various mass ranges, but no axion signal has been seen so far. Although those excluded mass regions with certain sensitivities in terms of axion-photon coupling constant...
Dr
John Blanchard
(Helmholtz-Institut Mainz),
Marina Gil
(Mrs.)
21/06/2018, 16:35
Presentation
The Cosmic Axion Spin Precession Experiment (CASPEr) is a multi-faceted research program using nuclear magnetic resonance (NMR) techniques to search for dark-matter-driven spin-precession.
CASPEr is naturally divided into two main research directions, based on two possible couplings to the Standard Model.
- CASPEr-Wind searches for spin precession induced by the coupling between...
Dr
Claudio Gatti
(INFN - LNF)
21/06/2018, 16:40
Presentation
The QUAX project is an R&D activity aimed at demonstrating the feasibility of an axion haloscope exploiting the axion electron coupling. To this end, a ferrimagnetic material is coupled to a microwave resonant cavity and a sensitive detector looks for excess power released into the system by an axion wind. In this talk I will present the latest results obtained by the QUAX collaboration in the...
Dr
Alexander Panin
(INR RAS, Moscow)
21/06/2018, 16:45
Presentation
We study parametric resonance of photons in cosmic Bose stars formed
by light bosonic (axion-like) dark matter. We argue that this effect
may lead to powerful bursts of maser radiation during the Bose star
collapse or its collision with compact astrophysical object like black
hole or neutron star. This may explain fast radiobursts (FRB) and some
other observational anomalies.
Alexandr Korochkin
(INR RAS)
21/06/2018, 16:50
Presentation
Unphysical distance dependence in convex features of deabsorbed blazar spectra (upward breaks), reported in 2014, suggested incorrect model of absorption of E>100 GeV gamma rays due to e+e- pair production on the extragalactic background light (EBL). We present results of the new study aimed to review previous findings, making use of an updated clean source sample, new gamma-ray data and most...
Sergio Arguedas Cuendis
(CERN)
21/06/2018, 16:55
Presentation
The Relic Axion Detector Experimental Setup (RADES) is an axion search project that uses a microwave filter as a detector. This type of filters allow the search for dark matter axions of masses in the decade 10-100 $\mu$eV. This presentation will focus on the proposal, design, construction and first tests of the RADES microwave filter. The filter consists of 5 stainless steel sub-cavities...
Dr
Markus Rummel
(Perimeter Institute / McMaster University)
21/06/2018, 17:00
Presentation
Axion-like particles (ALPs) can induce localised oscillatory modulations in the spectra of photon sources passing through astrophysical magnetic fields. Chandra and Persesus observations of quasars or AGNs located in or behind galaxy clusters represent a dataset of extraordinary quality for ALP searches. We use this dataset to search for X-ray spectral irregularities in the point source...
Dr
Giuseppe Messineo
(University of Florida)
21/06/2018, 17:05
Presentation
The ALPS II experiment searches for axion-like particles (ALPs) using the “light shining through a wall” technique. The collaboration is currently developing two different detection methods both targeting sensitivities to photon levels as low as a few photons per week. One approach, based on photon counting, uses a Transition Edge Sensor while the other involves heterodyne interferometry....
Mr
Chao Zhang
(Institut für Experimentalphysik, Univetsitaet Hamburg)
21/06/2018, 17:10
Presentation
The p-wave annihilation of the dark matter particle has recently gained wider interest. Generically, the expected annihilation cross section estimated from the required relic density is considerably smaller than the value of < \sigma v >≈ 3.0*10^{-26}cm^{3}s^{-1}) for a pure s-wave annihilation channel scenario. In this work, we provide expected annihilation rates from the dynamics of dSphs...
Dr
Maxim Goryachev
(University of Western Australia)
21/06/2018, 17:15
Presentation
We propose a new approach to axion detection based on precision frequency measurements as opposed to the traditional power detection approach. The approach utilises a high Quality Factor cavity supporting two mutually orthogonal modes. We demonstrate how axion modified Maxwell equations lead to either a beam splitter or parametric interaction terms in the axion up- or downconversion cases...
Mr
Gary Centers
(Johannes Gutenberg Universitaet), Mr
Nataniel Figueroa
(Johannes Gutenberg Universitaet)
21/06/2018, 17:20
Presentation
The Cosmic Axion Spin Precession Experiment (CASPEr), particularly the CASPEr-Wind, is a detection scheme searching for particles with a coupling to nuclear spin; some examples being dark matter candidates like the axion/axion-like particles, hidden photons, or any pseudo-Goldstone boson [1,2,3]. The coupling induces precession of the nuclear spin about the axion momentum which will be...
Dr
Kai Schmitz
(MPIK Heidelberg)
21/06/2018, 17:25
Presentation
Quantum fluctuations of the axion field during inflation easily result in dark matter isocurvature perturbations that exceed the upper bound from observations of the cosmic microwave background. This problem is solved in models of low-scale inflation where axion fluctuations are suppressed by the small value of the Hubble rate. In this talk, I review the resulting constraints on models of...
