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arXiv 1206.0986astro-ph.COgr-qc
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暗物质耗散

Dissipation of dark matter

Hermano Velten, Dominik J. Schwarz

摘要:

流体通常具有耗散性。我们探讨耗散的形式,在冷的暗物质流体的体积粘度。我们用超新星、重子声学振荡和宇宙微波背景的当前数据来约束这个模型。仅考虑各向同性和均匀的背景,粘性暗物质允许具有体积粘度$\lesssim 10^7$ Pa $\cdot$ s,这也与预期的综合萨克斯-沃尔夫效应(这困扰着一些具有体积粘度的模型)一致。我们进一步研究了粘性暗物质晕的小规模形成,这证明了对暗物质粘度的明显更强的约束。矮星系的存在只有在暗物质的粘性值$\lesssim 10^{-3}$ Pa $\cdot$ s小得多的情况下才能得到保证。

英文摘要:

Fluids often display dissipative properties. We explore dissipation in the form of bulk viscosity in the cold dark matter fluid. We constrain this model using current data from supernovae, baryon acoustic oscillations and the cosmic microwave background. Considering the isotropic and homogeneous background only, viscous dark matter is allowed to have a bulk viscosity $\lesssim 10^7$ Pa$\cdot$s, also consistent with the expected integrated Sachs-Wolfe effect (which plagues some models with bulk viscosity). We further investigate the small-scale formation of viscous dark matter halos, which turns out to place significantly stronger constraints on the dark matter viscosity. The existence of dwarf galaxies is guaranteed only for much smaller values of the dark matter viscosity, $\lesssim 10^{-3}$ Pa$\cdot$s.

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