Cosmic constraints rule out s-wave annihilation of light dark matter

Details Cosmic constraints rule out s-wave annihilation of light dark matter Cosmic constraints rule out s-wave annihilation of light dark matter

2008-09-09

arxiv.org/abs/0809.1523v2

Phys.Rev.D79:023515,2009

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, accepted at PRD

Scientific paper

10.1103/PhysRevD.79.023515

Light dark matter annihilating into electron-positron pairs emits a significant amount of internal bremsstrahlung that may contribute to the cosmic gamma-ray background. The amount of emitted gamma-rays depends on the dark matter clumping factor. Recent calculations indicate that this value should be of order $10^6-10^7$. That allows us to calculate the expected gamma-ray background contribution from dark matter annihilation. We find that the light dark matter model can be ruled out if a constant thermally-averaged cross section is assumed (s-wave annihilation). For more massive dark matter candidates like neutralinos, however, cosmic constraints are weaker.

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