论文标题
暗物质在物质功率谱系中的自我互动
Dark matter self-interactions in the matter power spectrum
论文作者
论文摘要
我们研究了在功率谱系上具有质量差距和自相互作用的僻静黑暗部门的烙印。当暗物质（DM）充分光线时，在几个keV的球场上，自我相互作用，我们会发现与$λ$ CDM以及免费流媒体DM有关的质量差异。为了强调相互作用在原始扰动演变中的作用，我们讨论了各种制度：从紧密耦合的完美液体的理想情况到温暖的暗物质的自由案例，包括小型但不变的自我互动的现实情况。我们借助Boltzmann求解器来计算所有这些制度中的物质功率谱。具有自相互作用的轻度黑暗部门受到Lyman-$α$数据的有效限制，我们发现自相互作用的存在使DM质量上的结合放松。作为一种具体的实现，我们研究了具有深色QCD样扇区的模型，其中DM由浅色黑色制成。
We study the imprints of secluded dark sectors with a mass gap and self-interactions on the matter power spectrum. When Dark Matter (DM) is sufficiently light, in the ballpark of a few KeV, and self-interacting we find qualitative difference with respect to $Λ$CDM and also to free streaming DM. In order to emphasize the role of interactions for the evolution of the primordial perturbations we discuss various regimes: ranging from the ideal case of a tightly coupled perfect fluid to the free case of Warm Dark Matter, including the realistic case of small but non-vanishing self-interactions. We compute the matter power spectrum in all these regimes with the aid of Boltzmann solvers. Light dark sectors with self-interactions are efficiently constrained by Lyman-$α$ data and we find that the presence of self-interactions relaxes the bound on the DM mass. As a concrete realization we study models with dark QCD-like sectors, where DM is made of light dark-pions.
