NEW COSMOLOGICAL LIMIT ON NEUTRINO MASS

被引:27
作者
FULLER, GM [1 ]
MALANEY, RA [1 ]
机构
[1] UNIV CALIF LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550
来源
PHYSICAL REVIEW D | 1991年 / 43卷 / 10期
关键词
D O I
10.1103/PhysRevD.43.3136
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We show that considerations of the equilibration of right- and left-handed neutrino seas in the early Universe and the well-known He-4 constraint on the number of relativistic degrees of freedom extant at the nucleosynthesis epoch lead to a new limit on the Dirac neutrino mass of m-mu <<300 keV. This constraint would apply to any neutrino so long as it had a purely Dirac mass and a life-time exceeding the nucleosynthesis time scale.
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页码:3136 / 3139
页数:4
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