NEUTRINO DECOUPLING IN THE EARLY UNIVERSE

被引：161

作者：

HANNESTAD, S

MADSEN, J

机构：

[1] Institute of Physics and Astronomy, University of Aarhus

来源：

PHYSICAL REVIEW D | 1995年 / 52卷 / 04期

关键词：

D O I：

10.1103/PhysRevD.52.1764

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A calculation of neutrino decoupling in the early Universe, including full Fermi-Dirac statistics and electron mass dependence in the weak reaction rates, is presented. We find that after decoupling the electron neutrinos contribute 0.83% more to the relativistic energy density than in the standard scenario, where neutrinos are assumed not to share the heating from e(+/-) annihilation. The corresponding number for mu and tau neutrinos is 0.41%. This has the consequence of modifying the primordial He-4 abundance by Delta Y = +1.0 x 10(-4), and the cosmological mass limit on light neutrinos by 0.2-0.5 eV.

引用

页码：1764 / 1769

页数：6

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