Cosmological constraints on late-time entropy production

被引：312

作者：

Kawasaki, M ^{[1
]}

Kohri, K

Sugiyama, N

机构：

[1] Univ Tokyo, Sch Sci, Res Ctr Early Universe, Tokyo 1330033, Japan

[2] Kyoto Univ, Dept Phys, Kyoto 606, Japan

[3] Univ Tokyo, Sch Sci, Dept Phys, Tokyo 1330033, Japan

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 82卷 / 21期

关键词：

D O I：

10.1103/PhysRevLett.82.4168

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate cosmological effects concerning the late-time entropy production due to the decay of nonrelativistic massive particles. The thermalization process of neutrinos after the entropy production is properly solved by using the Boltzmann equation. If a large entropy production takes place at late time t similar or equal to 1 sec, it is found that a large fraction of neutrinos cannot be thermalized. This fact loosens the tight constraint on the reheating temperature Tx from big bang nucleosynthesis and Tx could be as low as 0.5 MeV. The influence on large scale structure formation and cosmic microwave background anisotropies is also discussed. [S0031-9007(99)09223-6].

引用

页码：4168 / 4171

页数：4

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