TY - JOUR
T1 - Cosmological constraints on dark matter models with velocity-dependent annihilation cross section
AU - Hisano, Junji
AU - Kawasaki, Masahiro
AU - Kohri, Kazunori
AU - Moroi, Takeo
AU - Nakayama, Kazunori
AU - Sekiguchi, Toyokazu
PY - 2011/6/7
Y1 - 2011/6/7
N2 - 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).
AB - 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).
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U2 - 10.1103/PhysRevD.83.123511
DO - 10.1103/PhysRevD.83.123511
M3 - Article
AN - SCOPUS:79960821496
SN - 1550-7998
VL - 83
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 12
M1 - 123511
ER -