论文标题
末期的自我互动暗物质和$ h_0 $张力
Self-interacting dark matter from late decays and the $H_0$ tension
论文作者
论文摘要
我们根据信使wimp状状态的衰减研究了一种暗物质生产机制，以通过交换轻中介体进行自我交互的一对暗物质颗粒。它的独特热历史使中介器保持稳定，因此避免了宇宙微波背景和间接检测的强限制。这种机制的自然副产品可能是较晚的时间，即重组后，通过三体和一环衰变过渡到亚尺寸的深色辐射分量，向含有光中介器的状态。我们检查了这样的过程在多大程度上可以帮助减轻$ H_0 $的紧张。此外，该机制可以提供一种自然的方式来构建具有超强自我相互作用的暗物质模型，从而可能积极影响超质量的黑洞形成率。我们在Higgs门户网站暗物质模型中简单地实现了机制，并找到了参数空间的重要区域，该区域可导致哈勃张力的轻度放松，同时具有解决$λ$ CDM的小规模结构问题的潜力。
We study a dark matter production mechanism based on decays of a messenger WIMP-like state into a pair of dark matter particles that are self-interacting via exchange of a light mediator. Its distinctive thermal history allows the mediator to be stable and therefore avoid strong limits from the cosmic microwave background and indirect detection. A natural by-product of this mechanism is a possibility of a late time, i.e., after recombination, transition to subdominant dark radiation component through three-body and one-loop decays to states containing the light mediator. We examine to what extent such a process can help to alleviate the $H_0$ tension. Additionally, the mechanism can provide a natural way of constructing dark matter models with ultra-strong self-interactions that may positively affect the supermassive black hole formation rate. We provide a simple realization of the mechanism in a Higgs portal dark matter model and find a significant region of the parameter space that leads to a mild relaxation of the Hubble tension while simultaneously having the potential of addressing small-scale structure problems of $Λ$CDM.
