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arXiv 2203.04818astro-ph.COhep-ph
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多个暗物质粒子在不同时期衰变为暗辐射并不能缓解哈勃张力

Decay of multiple dark matter particles to dark radiation in different epochs does not alleviate the Hubble tension

Luis A. Anchordoqui, Vernon Barger, Danny Marfatia, Jorge F. Soriano

摘要:

衰变的冷暗物质(CDM)被认为是解决哈勃膨胀率和物质聚集之间紧张关系的一种机制。然而,宇宙微波背景(CMB)的偏振测量严重限制了暗物质在重组前的衰变比例,而大尺度结构对CMB各向异性的透镜效应对暗物质在重组后的衰变有很强的限制。总之,这些限制使得用衰减的暗物质来解释哈勃张力不太可能。针对这种情况,我们研究了一个暗物质系综与CDM粒子衰变成自由流动的暗辐射在不同的时代,可以缓解这个问题。我们发现它没有。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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