Orateur
Mlle
Keiko Nagao
(Nagoya University)
Description
Weakly interacting massive particle (WIMP) is a hopeful candidate of dark matter. In order to calculate the abundance of WIMP in the universe, its annihilation cross section is needed. We calculate the one-loop correction to the annihilation cross section in case that the correction is possible to be large.
When a exchanged boson has negligible mass compared to the mass of annihilating WIMP, the loop correction is significantly enhanced. It is known as "Sommerfeld enhancement". Even if a boson mass is smaller than or equal to the WIMP mass, the correction cen be sizable. We calculate the correction in that case, and find a formula to include the one-loop correction to the thermally averaged cross section, which can be used in general WIMP model. We apply our result to neutralino dark matter in the minimal supersymmetric standard model (MSSM), and show the correction can be larger than 1%.
Auteur principal
Mlle
Keiko Nagao
(Nagoya University)
