Impact of massive tau-neutrinos on primordial nucleosynthesis. Exact calculations

被引：25

作者：

Dolgov, AD

Hansen, SH

Semikoz, DV

机构：

[1] Teoret Astrofys Ctr, DK-2100 Copenhagen, Denmark

[2] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia

[3] ITEP, Moscow 113259, Russia

来源：

NUCLEAR PHYSICS B | 1998年 / 524卷 / 03期

关键词：

neutrino; massive; nucleosynthesis;

D O I：

10.1016/S0550-3213(98)00307-1

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：

The influence of a massive Majorana nu(tau) on primordial nucleosynthesis is rigorously calculated. The system of three integro-differential kinetic equations is solved numerically for m(nu tau) in the interval from 0 to 20 MeV. It is found that the usual assumption of kinetic equilibrium is strongly violated and non-equilibrium corrections considerably amplify the effect. Even a very weak restriction from nucleosynthesis, allowing for one extra massless neutrino species, permits to conclude that m(nu tau) < 1 MeV. For a stricter bound, e.g. for Delta N-nu < 0.3, the limit is m(nu tau) < 0.35 MeV. (C) 1998 Elsevier Science B.V.

引用

页码：621 / 638

页数：18

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