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

Junji Hisano, Masahiro Kawasaki, Kazunori Kohri, Takeo Moroi, Kazunori Nakayama, Toyokazu Sekiguchi

Research output: Contribution to journalArticlepeer-review

56 Citations (Scopus)

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 an annihilation cross section increasing with decreasing dark matter velocity, a big-bang nucleosynthesis and cosmic microwave background give stringent constraints. Particularly, if the cross section is enhanced by a factor larger than 103, the thermal relic scenario is excluded for the dark matter lighter than O(TeV).

Original languageEnglish
Article number123511
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume83
Issue number12
DOIs
Publication statusPublished - 2011 Jun 7

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