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arXiv 2102.06215astro-ph.COhep-ph
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自相互作用暗物质的宇宙演化

The Cosmological Evolution of Self-interacting Dark Matter

Daniel Egana-Ugrinovic, Rouven Essig, Daniel Gift, Marilena LoVerde

摘要:

研究了具有弹性和速度无关自相互作用的暗物质模型中宇宙学扰动的演化。这种相互作用在物质功率谱中被印上了暗声振荡的印记,可以通过实验探索来确定自散射的强度。具有自相互作用的模型与温暖的暗物质有相似之处,因为当暗物质速度色散相当大时,它们会导致小尺度上的功率抑制。尽管如此,无论是物理起源和抑制的程度不同的自相互作用的暗物质从传统的温暖的暗物质,与黑暗的声音地平线控制减少的功率在前一种情况下,和自由流长度在后者。我们彻底分析这些差异,通过使用新开发的玻尔兹曼代码的线性功率谱的计算。我们发现,虽然目前的莱曼- $α$数据不赞成传统的温暖的暗物质的质量小于5.3千电子伏,当自我相互作用包括在其最大值符合从子弹集群的界限,限制放宽到4.4千电子伏。最后,我们利用我们的分析设置新的界限轻标量单态暗物质。

英文摘要:

We study the evolution of cosmological perturbations in dark-matter models with elastic and velocity-independent self interactions. Such interactions are imprinted in the matter-power spectrum as dark acoustic oscillations, which can be experimentally explored to determine the strength of the self scatterings. Models with self interactions have similarities to warm dark matter, as they lead to suppression of power on small scales when the dark-matter velocity dispersion is sizable. Nonetheless, both the physical origin and the extent of the suppression differ for self-interacting dark matter from conventional warm dark matter, with a dark sound horizon controlling the reduction of power in the former case, and a free-streaming length in the latter. We thoroughly analyze these differences by performing computations of the linear power spectrum using a newly developed Boltzmann code. We find that while current Lyman-$α$ data disfavor conventional warm dark matter with a mass less than 5.3 keV, when self interactions are included at their maximal value consistent with bounds from the Bullet Cluster, the limits are relaxed to 4.4 keV. Finally, we make use of our analysis to set novel bounds on light scalar singlet dark matter.

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