Recently reported tentative evidence for a gamma-ray line in the Fermi-LAT data is of great potential interest for identifying the nature of dark matter. We compare the implications for decaying and annihilating dark matter taking the constraints from continuum gamma-rays, antiproton flux and morphology of the excess into account. We find that higgsino and wino dark matter are excluded, also for nonthermal production. Generically, the continuum gamma-ray flux severely constrains annihilating dark matter. Consistency of decaying dark matter with the spatial distribution of the Fermi-LAT excess would require an enhancement of the dark matter density near the Galactic center.
@article{arxiv.1206.7056,
title = {Decaying vs Annihilating Dark Matter in Light of a Tentative Gamma-Ray Line},
author = {Wilfried Buchmuller and Mathias Garny},
journal= {arXiv preprint arXiv:1206.7056},
year = {2015}
}
Comments
29 pages, 9 figures; v2: typo in appendix corrected