COSMOLOGICAL NEUTRINO MASS LIMIT REVISITED

被引：9

作者：

ENQVIST, K

UIBO, H

机构：

[1] Nordita, DK-2100 Copenhagen Ø

来源：

PHYSICS LETTERS B | 1993年 / 301卷 / 04期

关键词：

D O I：

10.1016/0370-2693(93)91166-K

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We consider the equilibration of the ''wrong-helicity'' Dirac neutrino states nu+ and nu-BAR in the early Universe via weak interactions and calculate carefully the thermally averaged production rate, taking into account all the relevant scattering and decay processes. Requiring that the production rate is less than the Hubble parameter at the onset of QCD phase transition so that the nucleosynthesis predictions are not contradicted, we find for T(QCD) congruent-to 200 MeV the upper limits m(nutau less-than-or-similar-to 740 keV and m(numu) less-than-or-similar-to 480 keV.

引用

页码：376 / 381

页数：6

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