Gamma-ray detection from gravitino dark matter decay in the $μν$SSM

Details Gamma-ray detection from gravitino dark matter decay in the $μν$SSM Gamma-ray detection from gravitino dark matter decay in the $μν$SSM

2009-06-19

arxiv.org/abs/0906.3681v3

Physics

High Energy Physics

High Energy Physics - Phenomenology

Final version to appear in JCAP, 13 pages, 3 figures

Scientific paper

The $\mu\nu$SSM provides a solution to the $\mu$-problem of the MSSM and explains the origin of neutrino masses by simply using right-handed neutrino superfields. Given that R-parity is broken in this model, the gravitino is a natural candidate for dark matter since its lifetime becomes much longer than the age of the Universe. We consider the implications of gravitino dark matter in the $\mu\nu$SSM, analyzing in particular the prospects for detecting gamma rays from decaying gravitinos. If the gravitino explains the whole dark matter component, a gravitino mass larger than 20 GeV is disfavored by the isotropic diffuse photon background measurements. On the other hand, a gravitino with a mass range between 0.1-20 GeV gives rise to a signal that might be observed by the FERMI satellite. In this way important regions of the parameter space of the $\mu\nu$SSM can be checked.

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