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.
@article{arxiv.1304.1992,
title = {Gamma-ray line from radiative decay of gravitino dark matter},
author = {Seng Pei Liew},
journal= {arXiv preprint arXiv:1304.1992},
year = {2013}
}
Comments
10 pages, 1 figure; added references, modified figure, expanded discussions, published version