Non-equilibrium corrections to the spectra of massless neutrinos in the early universe

被引：159

作者：

Dolgov, AD

Hansen, SH

Semikoz, DV

机构：

[1] RUSSIAN ACAD SCI,INST NUCL RES,MOSCOW 117312,RUSSIA

[2] ITEP,MOSCOW 113259,RUSSIA

来源：

NUCLEAR PHYSICS B | 1997年 / 503卷 / 1-2期

关键词：

neutrino; early universe; non-equilibrium kinetics;

D O I：

10.1016/S0550-3213(97)00479-3

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

Distortion of the equilibrium spectra of cosmic neutrinos due to interaction with hotter electrons and positrons in the primeval cosmic plasma is considered. The set of integro-differential. kinetic equations for neutrinos is accurately numerically solved. The relative corrections to neutrino energy densities are approximately 0.9% for nu(e) and 0.4% for nu(mu) and nu(tau). This effect results in 1.4 x 10(-4) increase in the primordial He-4 abundance. (C) 1997 Elsevier Science B.V. PACS: 98.80.Cq; 14.60.Lm; 05.20.Dd; 82.20.Mj.

引用

页码：426 / 444

页数：19

共 13 条

[1] PRIMORDIAL NUCLEOSYNTHESIS INCLUDING RADIATIVE, COULOMB, AND FINITE-TEMPERATURE CORRECTIONS TO WEAK RATES [J].