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arXiv · 1403.6503

3.5 keV x-ray line from decaying gravitino dark matter

N. -E. Bomark·L. Roszkowski
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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.

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N. -E. Bomark, L. Roszkowski. 2014-07-17. 3.5 keV x-ray line from decaying gravitino dark matter. https://doi.org/10.1103/physrevd.90.011701

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