Deciphering the archaeological record: Cosmological imprints of nonminimal dark sectors
Deciphering the archaeological record: Cosmological imprints of nonminimal dark sectors
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DOI：
10.1103/physrevd.101.123511
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发表时间：
2020-01
影响因子：
5
通讯作者：
K. Dienes;F. Huang;Jeff Kost;S. Su;B. Thomas
中科院分区：
文献类型：
--
作者：
K. Dienes;F. Huang;Jeff Kost;S. Su;B. Thomas
许多超出标准模型的物理学建议都提出了包含许多自由度的暗扇区。在这项工作中，我们探索了可能在这些黑暗部门中出现的非平凡动力学的宇宙学含义，重点关注完全发生在黑暗成分之间的衰变过程。首先，我们证明这种衰变会在暗物质相空间分布上留下显著的印记。特别是，这种分布不一定是热的——它甚至可以是多模态的，表现出作为动量函数的波峰和波谷的非平凡模式。然后，我们继续展示这些特征如何诱导对物质功率谱的修改。最后，我们评估了在多大程度上可以接近考古学的“逆”问题，即从物质功率谱中破译潜在黑暗部门的属性。事实上，本文的主要结果之一是一个非常简单的推测解析表达式，它允许直接从物质功率谱重建暗物质相空间分布的许多重要特征。因此，我们的结果提供了一个有趣的方法工具箱，用于了解和潜在地限制早期宇宙中非最小暗扇区的特征及其动力学。
Many proposals for physics beyond the Standard Model give rise to a dark sector containing many degrees of freedom. In this work, we explore the cosmological implications of the non-trivial dynamics which may arise within such dark sectors, focusing on decay processes which take place entirely among the dark constituents. First, we demonstrate that such decays can leave dramatic imprints on the resulting dark-matter phase-space distribution. In particular, this distribution need not be thermal -- it can even be multi-modal, exhibiting a non-trivial pattern of peaks and troughs as a function of momentum. We then proceed to show how these features can induce modifications to the matter power spectrum. Finally, we assess the extent to which one can approach the archaeological "inverse" problem of deciphering the properties of an underlying dark sector from the matter power spectrum. Indeed, one of the main results of this paper is a remarkably simple conjectured analytic expression which permits the reconstruction of many of the important features of the dark-matter phase-space distribution directly from the matter power spectrum. Our results therefore provide an interesting toolbox of methods for learning about, and potentially constraining, the features of non-minimal dark sectors and their dynamics in the early universe.