论文标题
Sub-Mev暗物质冻结的宇宙学
The cosmology of sub-MeV dark matter freeze-in
论文作者
论文摘要
暗物质（DM）可能是通过轻介质的冻结遗物，在该光中，DM是由热标准模型等离子体中极度微弱，以IR为主的过程产生的。在最简单的可行模型中，DM质量低于MEV量表，DM具有较小的有效电荷，并且天生具有非热相空间分布。该DM候选人将导致与标准宇宙学演化的可观察到。 In this work, we combine data from the cosmic microwave background (CMB), Lyman-$α$ forest, quasar lensing, stellar streams, and Milky Way satellite abundances to set a lower limit on freeze-in DM masses up to $\sim 20\,$keV, with the exact constraint depending on whether the DM thermalizes in its own sector.我们对CMB-S4实验，电离阵列的氢时代和Vera Rubin天文台进行预测，发现可以探索最高$ \ sim 80 \，$ keV的冻结DM质量。这些宇宙学探针与拟议的直接检测工作相辅相成，以寻找该DM候选者。
Dark matter (DM) could be a relic of freeze-in through a light mediator, where the DM is produced by extremely feeble, IR-dominated processes in the thermal Standard Model plasma. In the simplest viable models with the DM mass below the MeV scale, the DM has a small effective electric charge and is born with a nonthermal phase-space distribution. This DM candidate would cause observable departures from standard cosmological evolution. In this work, we combine data from the cosmic microwave background (CMB), Lyman-$α$ forest, quasar lensing, stellar streams, and Milky Way satellite abundances to set a lower limit on freeze-in DM masses up to $\sim 20\,$keV, with the exact constraint depending on whether the DM thermalizes in its own sector. We perform forecasts for the CMB-S4 experiment, the Hydrogen Epoch of Reionization Array, and the Vera Rubin Observatory, finding that freeze-in DM masses up to $\sim 80\,$keV can be explored. These cosmological probes are highly complementary with proposed direct-detection efforts to search for this DM candidate.
