Cannibal domination and the matter power spectrum

A. Erickcek, Pranjal Ralegankar, J. Shelton
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引用次数: 17

Abstract

Decoupled hidden sectors can easily and generically result in a period of cannibal domination, during which the dominant component of the Universe has an equation of state intermediate between radiation and matter due to self-heating by number-changing interactions. We present for the first time the consequences of a cannibal-dominated era prior to Big Bang Nucleosynthesis for structure formation on small scales. We find that an early cannibal-dominated era imprints a characteristic peak on the dark matter power spectrum, with scale and amplitude directly determined by the mass, lifetime, and number-changing interaction strength of the cannibal field. This enhancement to the small-scale matter power spectrum will generate early-forming dark matter microhalos, and we provide a detailed and transparent map between the properties of the cannibal species and the characteristic mass and formation time of these structures. These relations demonstrate how the internal workings of a hidden sector leave a potentially observable imprint on the matter power spectrum even if dark matter has no direct couplings to the Standard Model.
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食人族统治和物质功率谱
解耦的隐藏扇区很容易且普遍地导致一段食人统治时期,在此期间,由于数字变化相互作用的自热,宇宙的主导成分具有介于辐射和物质之间的状态方程。我们首次提出了在大爆炸核合成之前同类相食主导的时代对小尺度结构形成的影响。我们发现,早期的食人族统治时代在暗物质功率谱上留下了一个特征峰,其尺度和振幅直接取决于食人场的质量、寿命和数字变化的相互作用强度。这种对小尺度物质功率谱的增强将产生早期形成的暗物质微晕,我们提供了一种详细透明的食人族性质与这些结构的特征质量和形成时间之间的映射。这些关系表明,即使暗物质与标准模型没有直接的耦合,隐藏部分的内部运作如何在物质功率谱上留下潜在的可观察印记。
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