论文标题
旨在完整描述Mev暗物质解耦：对遗物丰度和$ n _ {\ rm eff} $的自洽确定
Towards a full description of MeV dark matter decoupling: a self-consistent determination of relic abundance and $N_{\rm eff}$
论文作者
论文摘要
MEV质量尺度上的热暗物质在中微子去耦和电子歼灭的高度非平凡时期具有丰度。解决多个相互作用部门的鲍尔茨曼方程所附加的技术障碍是相对论和非偏见主义的，从而避免了对该问题的全面处理。在这里，我们首次计算了暗暗物质的冻结，考虑到黑暗扇区，中微子和来自an灭和弹性散射过程的电磁相互作用等离子体之间的能量转移。我们开发了一种数值可行的处理，该处理允许在冷冻范围内跟踪光子和中微子温度，并对暗物质灭绝通道的任意分支比例进行$ n _ {\ rm eff} $的精确预测。此外，我们的治疗方法首次解决了涉及三个部门的冷冻温度演变。它进入了速度依赖性的灭绝通道的效率，以及所有世代的电子和中微子对的风味盲$ p $ p $ - an灭，我们发现当前的planck数据不包括一个复杂的标量暗物质质量的$ m_ϕ \ leq 7 $ mev的质量质量。
Thermal dark matter at the MeV mass-scale has its abundance set during the highly non-trivial epochs of neutrino decoupling and electron annihilation. The technical obstacles attached to solving Boltzmann equations of multiple interacting sectors being both relativistic and non-relativistic have to-date prevented the full treatment of this problem. Here, for the first time, we calculate the freeze-out of light dark matter, taking into account the energy transfer between the dark sector, neutrinos, and the electromagnetically interacting plasma from annihilation and elastic scattering processes alike. We develop a numerically feasible treatment that allows to track photon and neutrino temperatures across freeze-out and to arrive at a precision prediction of $N_{\rm eff}$ for arbitrary branching ratios of the dark matter annihilation channels. In addition, our treatment resolves for the first time the dark matter temperature evolution across freeze-out involving three sectors. It enters in the efficiency of velocity-dependent annihilation channels and for a flavor-blind $p$-wave annihilation into electron- and neutrino-pairs of all generations, we find the present Planck data excludes a complex scalar dark matter particle of mass of $m_ϕ\leq 7$ MeV.
