Cosmological constraints on multi-interacting dark matter
Cosmological constraints on multi-interacting dark matter
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DOI：
10.1088/1475-7516/2021/02/019
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发表时间：
2020-10
影响因子：
6.4
通讯作者：
Niklas Becker;D. C. Hooper;F. Kahlhoefer;J. Lesgourgues;Nils Schöneberg
中科院分区：
文献类型：
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作者：
Niklas Becker;D. C. Hooper;F. Kahlhoefer;J. Lesgourgues;Nils Schöneberg
ΛCDM 内部日益显着的紧张局势，加上实验室实验中缺乏对暗物质 (DM) 的检测，激发了人们对非最小暗物质的兴趣，这在理论上是有充分动机的，并激发了新的 DM 搜索策略。在这里，我们第一次考虑 DM 同时与光子、重子和暗辐射 (DR) 相互作用的可能性。我们开发了一种新的高效版本的玻尔兹曼代码类，允许一个 DM 物种具有多个交互通道。通过这个框架，我们重新评估了多重相互作用的 DM 场景中各种相互作用系数的现有宇宙学界限。我们发现这些不同的相互作用之间没有明显的简并性，并且表明它们的宇宙学效应在很大程度上是相加的。我们进一步研究了这些模型缓解宇宙张力的可能性，发现DM-光子和DM-DR相互作用的结合可以同时降低S8张力（从2.3σ到1.2σ）和H0张力（从4.3σ到3.1σ）。我们代码的公开发布将为研究各种丰富的黑暗领域铺平道路。
The increasingly significant tensions within ΛCDM, 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 S8 tension (from 2.3σ to 1.2σ) and the H0 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.