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 thesubstantially different angular distribution of the predicted gamma-ray signalwith respect to the case of annihilating DM, and the relatively poor (of order0.1°) angular resolution of gamma-ray detectors, the best strategy for detection is in this caseto look for an exotic contribution to the gamma-ray flux at high galactic latitudes, wherethe decaying DM contribution would resemble an astrophysical extragalactic component,similar to the one inferred by EGRET observations. Upcoming experiments such asGLAST and AMS-02 may identify this exotic contribution and discriminate between it andastrophysical sources, or place significant constraints on the mass and lifetime of DMparticles.
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