Limits on threshold and "Sommerfeld" enhancements in dark matter annihilation

被引：11

作者：

Backovic, Mihailo ^{[1
]}

Ralston, John P. ^{[1
]}

机构：

[1] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA

来源：

PHYSICAL REVIEW D | 2010年 / 81卷 / 05期

关键词：

ELECTRONS; ENERGIES;

D O I：

10.1103/PhysRevD.81.056002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We find model-independent upper limits on rates of dark matter annihilation in galactic halos. The Born approximation generally fails, while exotic threshold enhancements akin to "Sommerfeld factors" also turn out to be baseless. The most efficient annihilation mechanism involves perturbatively small decay widths that have largely been ignored. Widths that are very small compared to TeV mass scales suffice to cause large enhancements in the velocity averaged cross sections. Bound state formation in weakly coupled theories produces small effects due to wave function normalizations. Unitarity shows the Sommerfeld factor cannot produce large enhancements of cross sections, and serves to identify where those approximations break down.

引用

页数：8

共 42 条

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