Annihilation Cross Sections for Relic Densities in the Low Velocity Limit
Annihilation Cross Sections for Relic Densities in the Low Velocity Limit
复制标题
低速极限下遗迹密度的湮灭截面
DOI:
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复制
发表时间:
1994
期刊:
影响因子:
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通讯作者:
J. Wells
中科院分区:
文献类型:
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作者:
J. Wells
A simple method to calculate the total annihilation cross section of massive cold relics is presented. Exact expressions for $arel$, $rel$, and $crel$ of $sigma vrel=arel+rel vrel^2+crel vrel^4$ are obtained from simple derivatives of the squared annihilation amplitude. Three examples are given. In one example, the computed annihilation cross section of massive Dirac neutrinos confirms recent correct calculations.