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arXiv 0712.3499astro-phhep-ph
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残留的暗物质团块

Remnants of dark matter clumps

Veniamin Berezinsky, Vyacheslav Dokuchaev, Yury Eroshenko

摘要:

星系晕中被潮汐破坏的暗物质团块的中心核心发生了什么?我们通过模拟小尺度团块的潮汐破坏来计算银河系中暗物质团块残余物的存活概率。它表明,一个相当大的一部分的团块残余物可能会生存通过潮汐破坏在银河系的生命周期,如果一个核心的半径是相当小的。由此产生的幸存团块的质量谱向下延伸到宇宙学产生的团块的核心质量,具有最小的质量。由于湮灭信号主要是由核心的致密部分,外部的团块的破坏影响湮灭率相对较弱,潮汐破坏团块的幸存下来的致密残留物提供了很大的贡献,在银河系的湮灭信号。讨论了中性伴子模型中的不确定性所引起的最小团簇质量的不确定性。

英文摘要:

What happened to the central cores of tidally destructed dark matter clumps in the Galactic halo? We calculate the probability of surviving of the remnants of dark matter clumps in the Galaxy by modelling the tidal destruction of the small-scale clumps. It is demonstrated that a substantial fraction of clump remnants may survive through the tidal destruction during the lifetime of the Galaxy if the radius of a core is rather small. The resulting mass spectrum of survived clumps is extended down to the mass of the core of the cosmologically produced clumps with a minimal mass. Since the annihilation signal is dominated by the dense part of the core, destruction of the outer part of the clump affects the annihilation rate relatively weakly and the survived dense remnants of tidally destructed clumps provide a large contribution to the annihilation signal in the Galaxy. The uncertainties in minimal clump mass resulting from the uncertainties in neutralino models are discussed.

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