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arXiv 1907.08129astro-ph.CO
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$Λ$ PBH宇宙学中的早期结构形成

Early Structure Formation in $Λ$PBH Cosmologies

Derek Inman, Yacine Ali-Haïmoud

摘要:

冷暗物质(CDM)可以由原始黑洞(PBH)组成,除了或代替更正统的弱相互作用大质量粒子暗物质(PDM)。我们研究的第一个结构的形成,在这样的$Λ$ PBH宇宙学使用$N$体模拟从深辐射时代发展到红移99。当PBH只是CDM的一小部分时,它们被PDM覆盖,形成孤立的晕。另一方面,当PBH占CDM的大部分时,晕也可以通过许多PBH的聚集而生长。我们发现,晕质量函数是很好的模拟通过泊松统计假设随机初始条件。我们量化的结构形成引起的非线性速度,发现它们太小,显着影响CMB的限制。一个主要的挑战是如何最好地外推我们的结果,以降低红移相关的一些观测限制。

英文摘要:

Cold dark matter (CDM) could be composed of primordial black holes (PBH) in addition to or instead of more orthodox weakly interacting massive particle dark matter (PDM). We study the formation of the first structures in such $Λ$PBH cosmologies using $N$-body simulations evolved from deep in the radiation era to redshift 99. When PBH are only a small component of the CDM, they are clothed by PDM to form isolated halos. On the other hand, when PBH make most of the CDM, halos can also grow via clustering of many PBH. We find that the halo mass function is well modelled via Poisson statistics assuming random initial conditions. We quantify the nonlinear velocities induced by structure formation and find that they are too small to significantly impact CMB constraints. A chief challenge is how best to extrapolate our results to lower redshifts relevant for some observational constraints.

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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