论文标题
氢混合是21厘米宇宙学中较冷的重子的新机制
Hydrogen Mixing as a Novel Mechanism for Colder Baryons in 21 cm Cosmology
论文作者
论文摘要
边缘报道的异常21 cm吸收特征使对标准模型（SM）气体热能的暗物（dm）虹吸管的方案进行了研究。在与直接用SM颗粒散射进行冷却的备受关注的模型的背景下，我们表明可以通过中性的原子氢$ h $与退化的黑暗扇区状态$ H'$ H'$ H'$ H'$ H'$。对中型$ H $ -H'$振荡的分析显示，$ H'$ -DM交互的通用类型的可行参数空间可提供必要的冷却。在许多方面，该策略与其他建议形成鲜明对比，包括其宇宙学动力，模型建立的含义和互补的观察性签名。
The anomalous 21 cm absorption feature reported by EDGES has galvanized the study of scenarios in which dark matter (DM) siphons off thermal energy from the Standard Model (SM) gas. In a departure from the much-discussed models that achieve cooling by DM scattering directly with SM particles, we show that the same end can be achieved through neutral atomic hydrogen $H$ mixing with a degenerate dark sector state $H'$. An analysis of in-medium $H$-$H'$ oscillations reveals viable parameter space for generic types of $H'$-DM interactions to provide the requisite cooling. This strategy stands in stark contrast to other proposals in many respects, including its cosmological dynamics, model building implications, and complementary observational signatures.
