Joint Cosmic Microwave Background and Big Bang Nucleosynthesis Constraints on Light Dark Sectors with Dark Radiation
Joint Cosmic Microwave Background and Big Bang Nucleosynthesis Constraints on Light Dark Sectors with Dark Radiation
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宇宙微波背景和大爆炸核合成对暗辐射明暗区的联合约束
DOI：
10.1103/physrevlett.129.021302
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发表时间：
2022
影响因子：
8.6
通讯作者：
Ruderman, Joshua T.
中科院分区：
文献类型：
--
作者：
Giovanetti, Cara;Lisanti, Mariangela;Liu, Hongwan;Ruderman, Joshua T.
暗扇区为热产生亚GeV暗物质提供了一个令人信服的理论框架，并推动了一个大规模的新加速器和直接探测实验计划。我们使用从宇宙微波背景(CMB)测量的中微子物种的有效数量和来自大爆炸核合成的原始元素丰度来演示限制这些暗扇区的能力。作为一个具体的例子，我们考虑了一个任意自旋的暗物质粒子，它通过一个巨大的暗光子与标准模型相互作用，在暗区域中占据了任意数量的光自由度。我们排除了所有暗物质自旋和暗光子质量低于95%置信度的暗物质质量。这些界限适用于其他新的光，在暗区的惰性自由度，以及对于暗物质-电子的散射截面，比目前的实验约束低许多数量级。这些限制的强度只会随着未来的CMB实验而继续改善。
Dark sectors provide a compelling theoretical framework for thermally producing sub-GeV dark matter, and motivate an expansive new accelerator and direct-detection experimental program. We demonstrate the power of constraining such dark sectors using the measured effective number of neutrino species,, from the cosmic microwave background (CMB) and primordial elemental abundances from big bang nucleosynthesis. As a concrete example, we consider a dark matter particle of arbitrary spin that interacts with the standard model via a massive dark photon, accounting for an arbitrary number of light degrees of freedom in the dark sector. We exclude dark matter masses belowat 95% confidence for all dark matter spins and dark photon masses. These bounds hold regardless of additional new light, inert degrees of freedom in the dark sector, and for dark matter-electron scattering cross sections many orders of magnitude below current experimental constraints. The strength of these constraints will only continue to improve with future CMB experiments.