English

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

Cosmology and Nongalactic Astrophysics 2009-09-02 v3 High Energy Astrophysical Phenomena High Energy Physics - Phenomenology

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.

Keywords

Cite

@article{arxiv.0904.3626,
  title  = {Diffuse gamma-ray background and cosmic-ray positrons from annihilating dark matter},
  author = {Masahiro Kawasaki and Kazunori Kohri and Kazunori Nakayama},
  journal= {arXiv preprint arXiv:0904.3626},
  year   = {2009}
}

Comments

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

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