arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2010.04074astro-ph.COhep-ph
收藏

多重相互作用暗物质的宇宙学约束

Cosmological constraints on multi-interacting dark matter

Niklas Becker, Deanna C. Hooper, Felix Kahlhoefer, Julien Lesgourgues, Nils Schöneberg

摘要:

$Λ$ CDM内部日益显著的紧张局势,加上在实验室实验中缺乏对暗物质(DM)的检测,提高了人们对非最小暗扇区的兴趣,这在理论上是有充分动机的,并激发了DM的新搜索策略。在这里,我们认为,第一次,DM具有同时与光子,重子和暗辐射(DR)的相互作用的可能性。我们已经开发了一个新的和有效的版本的玻尔兹曼代码类,允许一个DM物种有多个相互作用的渠道。在这个框架下,我们重新评估现有的宇宙学界限的各种相互作用系数在多相互作用DM的情况。我们发现这些不同的相互作用之间没有明显的简并,并表明它们的宇宙学效应在很大程度上是加性的。我们进一步研究了这些模型缓解宇宙学张力的可能性,发现DM-光子和DM-DR相互作用的组合可以同时降低$S_8$张力(从$2.3σ$到$1.2σ$)和$H_0$张力(从$4.3σ$到$3.1σ$).公开发布我们的代码将为研究各种丰富的黑暗部门铺平道路。

英文摘要:

The increasingly significant tensions within $Λ$CDM, combined with the lack of detection of dark matter (DM) in laboratory experiments, have boosted interest in non-minimal dark sectors, which are theoretically well-motivated and inspire new search strategies for DM. Here we consider, for the first time, the possibility of DM having simultaneous interactions with photons, baryons, and dark radiation (DR). We have developed a new and efficient version of the Boltzmann code CLASS that allows for one DM species to have multiple interaction channels. With this framework we reassess existing cosmological bounds on the various interaction coefficients in multi-interacting DM scenarios. We find no clear degeneracies between these different interactions and show that their cosmological effects are largely additive. We further investigate the possibility of these models to alleviate the cosmological tensions, and find that the combination of DM-photon and DM-DR interactions can at the same time reduce the $S_8$ tension (from $2.3σ$ to $1.2σ$) and the $H_0$ tension (from $4.3σ$ to $3.1σ$). The public release of our code will pave the way for the study of various rich dark sectors.

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。

↑