Gamma-ray line from radiative decay of gravitino dark matter

Abstract

We study radiative decay of gravitino dark matter with trilinear R-parity violations. We show that the branching ratio of the decay of gravitino into monochromatic photon can be large enough to explain the observed gamma-ray line from the Galactic centre in the Fermi-LAT data without producing too much continuum gamma-ray and anti-proton flux. This scenario is realized when the mass of sfermions and the trilinear R-parity violating coupling are $O(1-10)$ TeV and $O(10^{-7}-10^{-6})$ respectively.

10 pages, 1 figure; added references, modified figure, expanded discussions, published version

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• Overview of searches for dark matter at the LHC
• Exploring neutrino physics at LHC via R-parity violating SUSY
• Probing neutrino physics at LHC through R-parity breaking supersymmetry
• Signatures of relic quantum nonequilibrium