Gamma-Rays from Decaying Dark Matter
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) 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.
Cite
@article{arxiv.0709.2299,
title = {Gamma-Rays from Decaying Dark Matter},
author = {Gianfranco Bertone and Wilfried Buchmuller and Laura Covi and Alejandro Ibarra},
journal= {arXiv preprint arXiv:0709.2299},
year = {2009}
}
Comments
15 pages, 5 figures, LaTeX with iopart.cls. Minor changes, typos corrected and references added/updated. Version accepted for publication in JCAP