arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2012.15380hep-phastro-ph.HE
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具有标量双轻子介体的自相互作用暗物质

Self-interacting Dark Matter with Scalar Dilepton Mediator

Chung Kao, Yue-Lin Sming Tsai, Gwo-Guang Wong

摘要:

冷暗物质(CDM)候选者具有弱相互作用的大质量粒子,能够成功地解释观测到的宇宙尺度暗物质遗迹密度和宇宙的大尺度结构。然而,在卫星星系尺度上的一些观测似乎与CDM模拟不一致。这被称为CDM的小规模问题。近年来,人们已经证明,自相互作用的暗物质(SIDM)与光介质提供了一个合理的解释小规模的问题。我们采用一个简单的模型与SIDM和索末菲增强的影响。在这个模型中,候选的暗物质是一个轻子标量粒子与轻介质。我们已经发现了几个区域的参数空间与适当的质量和耦合强度产生的遗物密度是一致的,与观察到的CDM遗物密度。此外,该模型满足最近的直接搜索和间接检测的暗物质,以及中微子的有效数量和观测到的宇宙的小尺度结构的约束。此外,该模型与有利的参数可以解决天体物理观测和$N$体模拟之间的差异。

英文摘要:

The cold dark matter (CDM) candidate with weakly interacting massive particles can successfully explain the observed dark matter relic density in cosmic scale and the large-scale structure of the Universe. However, a number of observations at the satellite galaxy scale seem to be inconsistent with CDM simulation. This is known as the small-scale problem of CDM. In recent years, it has been demonstrated that self-interacting dark matter (SIDM) with a light mediator offers a reasonable explanation for the small-scale problem. We adopt a simple model with SIDM and focus on the effects of Sommerfeld enhancement. In this model, the dark matter candidate is a leptonic scalar particle with a light mediator. We have found several regions of the parameter space with proper masses and coupling strength generating a relic density that is consistent with the observed CDM relic density. Furthermore, this model satisfies the constraints of recent direct searches and indirect detection for dark matter as well as the effective number of neutrinos and the observed small-scale structure of the Universe. In addition, this model with the favored parameters can resolve the discrepancies between astrophysical observations and $N$-body simulations.

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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