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

Abstract

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.

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

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Cited by in corpus (16)

• Contribution of the Gamma-ray Loud Radio Galaxies Core Emissions to the Cosmic MeV and GeV Gamma-Ray Background Radiation
• The nature of the Diffuse Gamma-Ray Background
• Effects of Dark Matter Annihilation on the Cosmic Microwave Background
• Cosmological constraints on dark matter models with velocity-dependent annihilation cross section
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