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arXiv 2209.04737astro-ph.CO
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原初黑洞和流运动对结构形成的影响

The effect of Primordial Black Holes and streaming motions on structure formation

F. Atrio-Barandela

摘要:

原始黑洞可能是宇宙中暗物质的重要组成部分。如果它们存在,它们会在物质功率谱中增加一个泊松分量。额外的能量将加速暗物质晕的出现,为第一批恒星和星系的形成埋下种子。Kashlinsky(2021)提出,额外的速度涨落会加速重子落入暗物质势阱。我们分析了原初黑洞对重子从复合到再电离的坍缩的影响,发现修正是Tseliakhovich \& Hirata(2010)首次发现的功率抑制的百分之几。然而,除了额外的功率,这种校正的动力学效应加速了质量范围为$10^4-10^{5-6}$ M $_\odot$的晕的形成,同时略微减少了质量范围为$10^6-10^8$ M $_\odot$的晕的形成,这证实了早期的分析估计和最近的数值模拟结果。

英文摘要:

Primordial Black Holes could be an important component of the dark matter in the Universe. If they exist, they would add a Poisson component to the matter power spectrum. The extra power would speed up the emergence of dark matter halos that seed the formation of first stars and galaxies. Kashlinsky (2021) suggested that the additional velocity fluctuations would accelerate the infall of baryons onto the dark matter potential wells. We analyze the effect of Primordial Black Holes on the baryon infall from recombination to reionization and find the correction to be a few percent of the power suppression first identified by Tseliakhovich \& Hirata (2010). However, the dynamical effect of this correction in addition to the extra power speeds up the formation of halos in the mass range of $10^4-10^{5-6}$M$_\odot$, while slightly decreasing the formation of those in the range $10^6-10^8$M$_\odot$ confirming earlier analytic estimates and recent results of numerical simulations.

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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