Conveners
Dark Matter
- Celine Boehm
Dark Matter
- Celine Boehm
Mr
Andrew J Powell
(University of Oxford)
27/05/2014, 14:30
Cosmology and Astroparticles
Parallel Session talk
Observations have revealed diffuse excess emission in a large number of galaxy clusters in the ~200 eV soft X-ray band: the Cluster Soft X-ray Excess. In this talk I will discuss how a primordially generated background of relativistic axion-like particles can explain this puzzling feature of galaxy cluster observations. Such a background is generically predicted to be produced from the decays...
Markus Rummel
27/05/2014, 14:50
Cosmology and Astroparticles
Parallel Session talk
Galaxy clusters can efficiently convert axion-like particles (ALPs) to photons. We propose that the recently claimed detection of a 3.55--3.57 keV line in the stacked spectra of a large number of galaxy clusters and the Andromeda galaxy may originate from the decay of either a scalar or fermionic $7.1$ keV dark matter species into an axion-like particle (ALP) of mass $m_{a} < 6\cdot...
Francesca Day
(University of Oxford)
27/05/2014, 15:10
Cosmology and Astroparticles
Parallel Session talk
I describe predictions for Milky Way halo dark matter decay to 3.55 keV axion like particles (ALPs) followed by ALP to photon conversion in the Milky Way's magnetic field. A scenario in which the 3.55 keV line observed in galaxy clusters and Andromeda is caused by dark matter decay to ALPs, which then mix with the photon in astrophysical magnetic fields is particularly well-motivated by the...
Dr
Nils-Erik Bomark
(NCBJ, Warsaw)
27/05/2014, 15:30
Cosmology and Astroparticles
Parallel Session talk
In supersymmetric models with R-parity violation, the gravitino is a natural dark matter candidate. The gravitino can also naturally be very light, opening for the possibility of being warm dark matter as well as explaining the recently claimed 3.5 keV X-ray line from the XMM-Newton telescope.
We show that loops induced by trilinear lepton number violating couplings can indeed give a good...
Lucien Heurtier
(C)
27/05/2014, 15:50
SuSy and other BSM phenomenology
Parallel Session talk
In this talk, I will present new results about the recently observed X-ray line in different galaxy clusters. I will expose different scenarios where a keV dark matter annihilates to produce a monochromatic signal. The process is generated through the exchange of a light scalar of mass of order 300 keV - 50 MeV coupling to photon through loops or higher dimensional operators. For natural...
Davide Franco
(C)
27/05/2014, 16:40
Cosmology and Astroparticles
Parallel Session talk
DarkSide-50 (DS-50) at Gran Sasso underground laboratory, Italy, is a direct dark matter detector based on a TPC with underground liquid argon.
DS-50 is in data taking since Nov 2013, collecting more than 2e7 events with atmospheric argon. Based on the present exposure DS-50 has shown to be a "background-free" experiment for direct dark matter search. DS-50 TPC is installed inside an active...
Dr
Andreas Goudelis
(LAPTh (CNRS))
27/05/2014, 17:00
Cosmology and Astroparticles
Parallel Session talk
I will discuss a simple model that can give rise to isospin-violating interactions of Dirac fermion asymmetric dark matter to protons and neutrons through the interference of a scalar and U(1)′ gauge boson contribution. The model can yield a large suppression of the elastic scattering cross section off certain elements relative to others thus highlighting the need for the construction of...
Dr
Martin Winkler
(DESY)
27/05/2014, 17:20
Cosmology and Astroparticles
Parallel Session talk
The AMS-02 experiment is currently performing a high precision measurement of the cosmic ray antiproton flux. The identification of a possible signal from dark matter requires a thorough understanding of the secondary background arising cosmic ray spallations on the interstellar matter. In this light, we perform a reevaluation of the secondary source term using newly available experimental...
carlos yaguna
(Muenster University)
27/05/2014, 17:40
Cosmology and Astroparticles
Parallel Session talk
The freeze-in mechanism of dark matter production provides a simple and intriguing alternative to the WIMP paradigm. In this talk, I show that freeze-in can be used to account for the dark matter in the so-called singlet fermionic model. In it, the SM is extended with only two additional fields, a singlet scalar that mixes with the Higgs boson, and the dark matter particle, a fermion assumed...
