3.5 keV x-ray line from decaying gravitino dark matter
Abstract
Extremely weakly interacting particles like the gravitino may be stable enough on cosmological time scales to constitute a good dark matter candidate even in the presence of R-parity violation. We consider the possibility that the recently identified 3.5 keV x-ray line can be generated in light gravitino decays to neutrinos and photons. We find that this is indeed possible in loop processes induced by trilinear lepton-number-violating couplings. We show that in order to avoid overproduction of gravitinos, the reheating temperature has to be at most around 100 GeV to 1 TeV. Finally we briefly discuss associated LHC phenomenology due to a relatively light gluino and multijet/multilepton events from R-parity violating decays of neutralinos.
Keywords
Cite
@article{arxiv.1403.6503,
title = {3.5 keV x-ray line from decaying gravitino dark matter},
author = {N. -E. Bomark and L. Roszkowski},
journal= {arXiv preprint arXiv:1403.6503},
year = {2014}
}
Comments
Version to be published in PRD