arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0903.0189astro-ph.COhep-ph
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粒子模型与暗物质的小尺度结构

Particle Models and the Small-Scale Structure of Dark Matter

Torsten Bringmann

摘要:

早期宇宙中弱相互作用大质量粒子(WIMP)的动力学解耦设定了一个尺度,可以直接转化为物质密度波动谱中的小尺度截止。这里提出的形式主义允许一个精确的描述的去耦过程,从而确定这个规模的基础WIMP微观物理的细节,以高精度。由于退耦温度为几兆电子伏到几千兆电子伏,形成的最小原晕的质量范围在10^{-11}到几乎10^{-3}太阳质量之间-这个范围比早先用退耦温度的数量级估计所发现的要小一些;对于一个给定的WIMP模型,实际的截止质量通常比以这种方式导出的大10倍,尽管在某些情况下该差异可以大到几百倍。观测的后果和前景,以探测这个小规模的截止,这将提供一个迷人的新窗口到粒子性质的暗物质,讨论

英文摘要:

The kinetic decoupling of weakly interacting massive particles (WIMPs) in the early universe sets a scale that can directly be translated into a small-scale cutoff in the spectrum of matter density fluctuations. The formalism presented here allows a precise description of the decoupling process and thus the determination of this scale to a high accuracy from the details of the underlying WIMP microphysics. With decoupling temperatures of several MeV to a few GeV, the smallest protohalos to be formed range between 10^{-11} and almost 10^{-3} solar masses -- a somewhat smaller range than what was found earlier using order-of-magnitude estimates for the decoupling temperature; for a given WIMP model, the actual cutoff mass is typically about a factor of 10 greater than derived in that way, though in some cases the difference may be as large as a factor of several 100. Observational consequences and prospects to probe this small-scale cutoff, which would provide a fascinating new window into the particle nature of dark matter, are discussed

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。

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