科研之友
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摘要
We study the effect of the MeV-scale asymmetric dark matter annihilation on the effective number of neutrinos N-eff at the epoch of the big bang nucleosynthesis. If the asymmetric dark matter chi couples more strongly to the neutrinos nu than to the photons gamma and electrons e(-), Gamma(chi gamma,chi e) << Gamma(chi nu), or Gamma(chi gamma,chi e) >> Gamma(chi nu), the lower mass limit on the asymmetric dark matter is about 18 MeV for N-eff similar or equal to 3.0.
- 出版日期2016-2-4
