Goldstino decoupling in spontaneously broken supergravity theories

被引：35

作者：

Gherghetta, T

机构：

[1] Department of Physics, University of Michigan, Ann Arbor

来源：

NUCLEAR PHYSICS B | 1997年 / 485卷 / 1-2期

关键词：

gravitino; supergravity; nucleosynthesis; decoupling;

D O I：

10.1016/S0550-3213(96)00608-6

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：

If the gravitino is sufficiently light and stable it will behave as an effective massless neutrino species at the time of nucleosynthesis. Depending on the temperature at which it decouples from the thermal bath in the early universe, the gravitino mass will be bounded by the primordial He-4 abundance, Assuming a conservative estimate that the number of neutrino families, N-nu < 3.6, superlight gravitinos with a mass m(3/2) less than or similar to 10(-6) eV are ruled out, This bound is weaker than previous estimates because the Goldstino annihilation cross section was overestimated.

引用

页码：25 / 37

页数：13

共 25 条

[21] COSMIC ABUNDANCES OF STABLE PARTICLES - IMPROVED ANALYSIS [J].