Enhancement of dark matter annihilation via Breit-Wigner resonance

被引：106
作者：
Guo, Wan-Lei [1 ]
Wu, Yue-Liang [1 ]
机构：
[1] Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China
来源：
PHYSICAL REVIEW D | 2009年 / 79卷 / 05期
关键词：
ABUNDANCES;
D O I：
10.1103/PhysRevD.79.055012
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The Breit-Wigner enhancement of the thermally averaged annihilation cross section <sigma v > is shown to provide a large boost factor when the dark matter annihilation process nears a narrow resonance. We explicitly demonstrate the evolution behavior of the Breit-Wigner enhanced <sigma v > as the function of universe temperature for both the physical and unphysical pole cases. It is found that both of the cases can lead a large enough boost factor to explain the recent PAMELA, ATIC, and PPB-BETS anomalies. We also calculate the coupling of the annihilation process, which is useful for an appropriate model building to give the desired dark matter relic density.
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