Diffuse gamma-ray background and cosmic-ray positrons from annihilating dark matter

Details Diffuse gamma-ray background and cosmic-ray positrons from annihilating dark matter Diffuse gamma-ray background and cosmic-ray positrons from annihilating dark matter

2009-04-23

arxiv.org/abs/0904.3626v3

Phys.Rev.D80:023517,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

20 pages, 11 figures; references added; to appear in PRD

Scientific paper

10.1103/PhysRevD.80.023517

We study the annihilating dark matter contribution to the extra-galactic diffuse gamma-ray background spectrum, motivated by the recent observations of cosmic-ray positron/electron anomalies. The observed diffuse gamma-ray flux provides stringent constraint on dark matter models and we present upper bounds on the annihilation cross section of the dark matter. It is found that for the case of cored dark matter halo profile, the diffuse gamma-rays give more stringent bound compared with gamma-rays from the Galactic center. The Fermi satellite will make the bound stronger.

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