Cannibalism's lingering imprint on the matter power spectrum

Cannibalism's lingering imprint on the matter power spectrum
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食人行为在物质功率谱上留下了挥之不去的印记

DOI:
10.1088/1475-7516/2022/01/017
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发表时间:
2022
影响因子:
6.4
通讯作者:
Shelton, Jessie
Shelton, Jessie
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Erickcek, Adrienne L.;Ralegankar, Pranjal;Shelton, Jessie

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早期宇宙可能包含内部热化的暗区,这些暗区与标准模型解耦。在这种情况下,由暗区中最轻的粒子组成的残余暗热浴可能会在大爆炸核合成之前引发早期物质统治的时代,这对最小的暗物质结构具有潜在的可观察到的影响。这种最轻的暗粒子可以很容易地和一般地具有改变数量的自相互作用,从而产生”食人”行为。我们认为宇宙学的一个最初的次主导的食人族物种来暂时驱动宇宙的膨胀,我们提供了一个简单的地图之间的粒子性质的食人族物种和增强的暗物质扰动增长在这样的宇宙学的关键特征。我们进一步证明,食人族的自我相互作用可以确定小规模的截止在物质功率谱,即使食人族的自我相互作用冻结之前食人族的统治。
The early universe may have contained internally thermalized dark sectors that were decoupled from the Standard Model. In such scenarios, the relic dark thermal bath, composed of the lightest particle in the dark sector, can give rise to an epoch of early matter domination prior to Big Bang Nucleosynthesis, which has a potentially observable impact on the smallest dark matter structures. This lightest dark particle can easily and generically have number-changing self-interactions that give rise to" cannibal" behavior. We consider cosmologies where an initially sub-dominant cannibal species comes to temporarily drive the expansion of the universe, and we provide a simple map between the particle properties of the cannibal species and the key features of the enhanced dark matter perturbation growth in such cosmologies. We further demonstrate that cannibal self-interactions can determine the small-scale cutoff in the matter power spectrum even when the cannibal self-interactions freeze out prior to cannibal domination.
DOI: --
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期刊:
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