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arXiv 0809.0497astro-ph
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暗物质焦散

Dark Matter Caustics

Simon D. M. White, Mark Vogelsberger

摘要:

焦散线是暗物质分布中结构非线性增长的一般特征。如果暗物质是绝对冷的,那么它的质量密度就会在焦散线上发散,并且参与其中的单个粒子的综合湮灭概率也会发散。对于现实的暗物质候选者,这种行为是正规化的小,但非零的初始热速度。我们提出了一个从热,暖或冷暗物质的初始条件,可以直接在宇宙学N体代码的演化的数学处理。它允许识别焦散线和估计其湮没辐射在结构形成的完全一般模拟。

英文摘要:

Caustics are a generic feature of the nonlinear growth of structure in the dark matter distribution. If the dark matter were absolutely cold, its mass density would diverge at caustics, and the integrated annihilation probability would also diverge for individual particles participating in them. For realistic dark matter candidates, this behaviour is regularised by small but non-zero initial thermal velocities. We present a mathematical treatment of evolution from Hot, Warm or Cold Dark Matter initial conditions which can be directly implemented in cosmological N-body codes. It allows the identification of caustics and the estimation of their annihilation radiation in fully general simulations of structure formation.

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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