Conveners
Morning 52
- Konstantin Zioutas
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...
