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arXiv · 0709.2299

Gamma-Rays from Decaying Dark Matter

Gianfranco Bertone·Wilfried Buchmuller·Laura Covi·Alejandro Ibarra
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Abstract

We study the prospects for detecting gamma-rays from decaying Dark Matter (DM), focusing in particular on gravitino DM in R-parity breaking vacua. Given the substantially different angular distribution of the predicted gamma-ray signal with respect to the case of annihilating DM, and the relatively poor (of order 0.1$^\circ$) angular resolution of gamma-ray detectors, the best strategy for detection is in this case to look for an exotic contribution to the gamma-ray flux at high galactic latitudes, where the decaying DM contribution would resemble an astrophysical extra-galactic component, similar to the one inferred by EGRET observations. Upcoming experiments such as GLAST and AMS-02 may identify this exotic contribution and discriminate it from astrophysical sources, or place significant constraints on the mass and lifetime of DM particles.

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Gianfranco Bertone, Wilfried Buchmuller, Laura Covi, Alejandro Ibarra. 2007-10-11. Gamma-Rays from Decaying Dark Matter. https://doi.org/10.1088/1475-7516%2F2007%2F11%2F003

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