arXiv:1102.4658·v2·High Energy Physics — Phenomenology
Cosmological constraints on dark matter models with velocity-dependent annihilation cross section
Junji Hisano🇯🇵 · Masahiro Kawasaki🇯🇵 · Kazunori Kohri🇯🇵 · Takeo Moroi🇯🇵 · Kazunori Nakayama🇯🇵 · Toyokazu Sekiguchi🇯🇵
Abstract
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.
Comments: 23 pages, 9 figures; Added references