索末菲增强能提高WIMP湮灭增强因子吗？
Can the WIMP annihilation boost factor be boosted by the Sommerfeld enhancement?
摘要：
我们证明，索末菲修正CDM湮灭可以是可观的，如果即使是一个小组成部分的暗物质是非常冷的。次晕子结构提供了这样一种可能性，因为最小的团块相对较冷，并且由于不完全的相空间混合而包含更冷的子结构。轻子通道可以增强合理的模型和太阳邻域的提升需要考虑PAMELA/ATIC数据是合理的，特别是在几个TeV质量的中性伴子的情况下，索末菲-校正后的增强被发现是$\sim10^4-10^5.$索末菲效应的饱和被示出发生在$β\sim 10^{-4},$之下，从而将贡献子结构的范围限制在$\sim 10^5\rm M_\odot.$之上。来自湮灭的伽马射线信号将超过EGRET约束，除非湮灭到重夸克或规范玻色子的通道被抑制。轻子通道伽马射线可能被费米卫星探测到，不是来自内部星系的子结构被潮汐破坏，而是作为来自外部晕的准各向同性背景，除非外部子结构比内部子结构更不集中和/或CDM密度分布到维里半径明显变陡。
英文摘要：
We demonstrate that the Sommerfeld correction to CDM annihilations can be appreciable if even a small component of the dark matter is extremely cold. Subhalo substructure provides such a possibility given that the smallest clumps are relatively cold and contain even colder substructure due to incomplete phase space mixing. Leptonic channels can be enhanced for plausible models and the solar neighbourhood boost required to account for PAMELA/ATIC data is plausibly obtained, especially in the case of a few TeV mass neutralino for which the Sommerfeld-corrected boost is found to be $\sim10^4-10^5.$ Saturation of the Sommerfeld effect is shown to occur below $β\sim 10^{-4},$ thereby constraining the range of contributing substructures to be above $\sim 10^5\rm M_\odot.$ We find that the associated diffuse gamma ray signal from annihilations would exceed EGRET constraints unless the channels annihilating to heavy quarks or to gauge bosons are suppressed. The lepton channel gamma rays are potentially detectable by the FERMI satellite, not from the inner galaxy where substructures are tidally disrupted, but rather as a quasi-isotropic background from the outer halo, unless the outer substructures are much less concentrated than the inner substructures and/or the CDM density profile out to the virial radius steepens significantly.
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