Gamma-Rays from Decaying Dark Matter

Details Gamma-Rays from Decaying Dark Matter Gamma-Rays from Decaying Dark Matter

2007-09-14

arxiv.org/abs/0709.2299v2

JCAP 0711:003,2007

Astronomy and Astrophysics

Astrophysics

15 pages, 5 figures, LaTeX with iopart.cls. Minor changes, typos corrected and references added/updated. Version accepted for

Scientific paper

10.1088/1475-7516/2007/11/003

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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