Asymmetric dark matter and effective number of neutrinos

被引：4

作者：

Kitabayashi, Teruyuki ^{[1
]}

Kurosawa, Yoshihiro ^{[1
]}

机构：

[1] Tokai Univ, Dept Phys, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 2591292, Japan

来源：

PHYSICAL REVIEW D | 2016年 / 93卷 / 03期

关键词：

STABLE PARTICLES; ANNIHILATIONS; BARYON; LIMITS;

D O I：

10.1103/PhysRevD.93.033002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

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.

引用

页数：14