论文标题
逐步逐步进行了声学暗物质，大规模结构和哈勃张力
Stepped Partially Acoustic Dark Matter, Large Scale Structure, and the Hubble Tension
论文作者
论文摘要
我们提出了一个新的互动的黑暗扇区模型，即部分声学暗物质（斯巴达克斯），可以同时解决当前宇宙学数据中最重要的两个紧张局势，即$ H_0 $和$ S_8 $问题。就像在部分声学的暗物质（PACDM）场景中一样，该模型具有深色物质的子分量，该分量与高温下的暗辐射相互作用，抑制了小尺度上结构的生长，从而解决了$ S_8 $问题。然而，在宽松的模型中，深色辐射包括一个具有光质量的成分，该组件变成非相关性接近物质辐射平等时期。随着这种光的成分消灭，其余的深色辐射加热及其与暗物质的相互作用。黑暗扇区的加热导致黑暗辐射中的相对能量密度逐渐增加，大大降低了$ H_0 $张力，而暗物质和深色辐射的解耦可确保较大尺度的功率谱与$λ$ CDM相同。
We propose a new interacting dark sector model, Stepped Partially Acoustic Dark Matter (SPartAcous), that can simultaneously address the two most important tensions in current cosmological data, the $H_0$ and $S_8$ problems. As in the Partially Acoustic Dark Matter (PAcDM) scenario, this model features a subcomponent of dark matter that interacts with dark radiation at high temperatures, suppressing the growth of structure at small scales and thereby addressing the $S_8$ problem. However, in the SPartAcous model, the dark radiation includes a component with a light mass that becomes non-relativistic close to the time of matter-radiation equality. As this light component annihilates away, the remaining dark radiation heats up and its interactions with dark matter decouple. The heating up of the dark sector results in a step-like increase in the relative energy density in dark radiation, significantly reducing the $H_0$ tension, while the decoupling of dark matter and dark radiation ensures that the power spectrum at larger scales is identical to $Λ$CDM.
