Cosmological Lower Bound on Dark Matter Masses from the Soft Gamma-ray Background

Details Cosmological Lower Bound on Dark Matter Masses from the Soft Gamma-ray Background Cosmological Lower Bound on Dark Matter Masses from the Soft Gamma-ray Background

2004-12-26

arxiv.org/abs/astro-ph/0412630v1

Phys.Rev. D71 (2005) 021303

Astronomy and Astrophysics

Astrophysics

5 pages, 5 figures; accepted for publication in PRD, Rapid Communication

Scientific paper

10.1103/PhysRevD.71.021303

Motivated by a recent detection of 511 keV photons from the center of our Galaxy, we calculate the spectrum of the soft gamma-ray background of the redshifted 511 keV photons from cosmological halos. Annihilation of dark matter particles into electron-positron pairs makes a substantial contribution to the gamma-ray background. Mass of such dark matter particles must be <~ 100 MeV so that resulting electron-positron pairs are on-relativistic. On the other hand, we show that in order for the annihilation not to exceed the observed background, the dark matter mass needs to be >~ 20 MeV. We include the contribution from the active galactic nuclei and supernovae. The halo substructures may increase the lower bound to >~ 60 MeV.

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