PRISMA+ Cluster of Excellence and Mainz Institute for Theoretical Physics, Johannes Gutenberg University, 55099 Mainz, Germany.
Leinweber Center for Theoretical Physics, Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA.
Phys Rev Lett. 2023 Jan 20;130(3):031803. doi: 10.1103/PhysRevLett.130.031803.
We estimate the maximum direct detection cross section for sub-GeV dark matter (DM) scattering off nucleons. For DM masses in the range 10 keV-100 MeV, cross sections greater than 10^{-36}-10^{-30} cm^{2} seem implausible. We present a DM candidate which realizes this maximum cross section: highly interactive particle relics (HYPERs). After HYPERs freeze-in, a dark sector phase transition decreases the mediator's mass. This increases the HYPER's direct detection cross section without impacting its abundance or measurements of big bang nucleosynthesis and the cosmic microwave background.
我们估计了亚GeV 暗物质（DM）与核子散射的最大直接探测截面。对于 DM 质量在 10keV-100MeV 范围内，截面大于 10^{-36}-10^{-30}cm^{2}似乎不太可能。我们提出了一个实现这个最大截面的 DM 候选者：高相互作用粒子遗迹（HYPERs）。在 HYPERs 冻结之后，暗物质相转变会降低媒介的质量。这会增加 HYPER 的直接探测截面，而不会影响其丰度或对大爆炸核合成和宇宙微波背景的测量。
