Cosmological constraints on dark matter models with velocity-dependent annihilation cross section

Details Cosmological constraints on dark matter models with velocity-dependent annihilation cross section Cosmological constraints on dark matter models with velocity-dependent annihilation cross section

2011-02-23

arxiv.org/abs/1102.4658v2

Phys.Rev.D83:123511,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, 9 figures; Added references

Scientific paper

10.1103/PhysRevD.83.123511

We derive cosmological constraints on the annihilation cross section of dark matter with velocity-dependent structure, motivated by annihilating dark matter models through Sommerfeld or Breit-Wigner enhancement mechanisms. In models with annihilation cross section increasing with decreasing dark matter velocity, big-bang nucleosynthesis and cosmic microwave background give stringent constraints.

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