论文标题
食人的统治和物质功率谱
Cannibal domination and the matter power spectrum
论文作者
论文摘要
脱钩的隐藏扇区可以轻松而普遍地导致一段时间的同时统治时期，在此期间，宇宙的主要组成部分具有辐射和物质之间的状态方程，这是由于数量变化的相互作用而自动加热的。我们首次提出了大爆炸核合成之前，以小尺度的结构形成之前，以小食虫为主时代的后果提出了后果。我们发现，早期以小食小交叉统治的时代印记在暗物质功率谱上是一个特征性的峰，尺度和振幅直接由质量，寿命和数字变化的交互强度确定。对小规模物质功率谱的这种增强将产生早期形成的暗物质microhalos，并且我们在食人物种的性质与这些结构的特征性质量和这些结构的时间之间提供了详细且透明的图。这些关系表明，即使暗物质与标准模型没有直接的耦合，隐藏部门的内部运作方式如何在物质功率谱上留下可能可观察到的烙印。
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.
