论文标题
在不同时期的多个暗物质颗粒衰变至深色辐射不会减轻哈勃张力
Decay of multiple dark matter particles to dark radiation in different epochs does not alleviate the Hubble tension
论文作者
论文摘要
衰减的冷暗物质（CDM）被认为是解决哈勃膨胀率和物质聚类的紧张局势的机制。然而，宇宙微波背景（CMB）的极化测量严重限制了重组前暗物质衰减的比例，并且通过大规模结构对CMB各向异性的镜头对重组后的暗物质衰减设定了强限制。这些约束共同解释了哈勃张力，这不太可能使暗物质腐烂。为了应对这种情况，我们研究了与不同时期中自由流式深色辐射腐烂成的CDM颗粒的暗物质合奏是否可以减轻问题。我们发现不是。
Decaying cold dark matter (CDM) has been considered as a mechanism to tackle the tensions in the Hubble expansion rate and the clustering of matter. However, polarization measurements of the cosmic microwave background (CMB) severely constrain the fraction of dark matter decaying before recombination, and lensing of the CMB anisotropies by large-scale structure set strong constraints on dark matter decaying after recombination. Together, these constraints make an explanation of the Hubble tension in terms of decaying dark matter unlikely. In response to this situation, we investigate whether a dark matter ensemble with CDM particles decaying into free streaming dark radiation in different epochs can alleviate the problem. We find that it does not.
