arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0901.1450hep-phastro-ph.CO
收藏

利用Breit-Wigner共振增强暗物质湮灭

Enhancement of Dark Matter Annihilation via Breit-Wigner Resonance

Wan-Lei Guo, Yue-Liang Wu

摘要:

当暗物质湮灭过程接近窄共振时,热平均湮灭截面<σv>的Breit-Wigner增强提供了一个大的增强因子.我们明确地证明了物理和非物理极点情况下Breit-Wigner增强的<σv>作为宇宙温度的函数的演化行为。研究发现,这两种情况下,可以导致一个足够大的助推因子来解释最近的PAMELA,ATIC和PPB-BETS异常。我们还计算了湮灭过程的耦合,这对于建立一个合适的模型来给出所需的暗物质遗迹密度是有用的。

英文摘要:

The Breit-Wigner enhancement of the thermally averaged annihilation cross section <σv> 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 <σv> as the function of universe temperature for both the physical and unphysical pole cases. It is found that both of the cases can lead an enough large boost factor to explain the recent PAMELA, ATIC and PPB-BETS anomalies. We also calculate the coupling of annihilation process, which is useful for an appropriate model building to give the desired dark matter relic density.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑