标题： 暗物质在强CP问题的镜像解中的作用 显示英文标题

标题： Dark Matter in A Mirror Solution to the Strong CP Problem

摘要： 我们研究了在参考文献~\cite{Bonnefoy:2023afx}中的一个最小模型实现中的暗物质（DM）热产生，其中宇称被用来通过将整个标准模型（SM）转化为镜像副本以解决强CP问题。 尽管镜像电子$e^{\prime}$是一个良好的DM候选者，但其可行性受到镜像上夸克$u^{\prime}$的存在所困扰，其丰度与$e^{\prime}$丰度密切相关，必须被抑制。 这可以通过一个顺序冻结机制来实现，其中镜像光子首先由SM胶子产生，然后镜像光子产生$e'$。 在计算了这种双重冻结机制的细节后，我们讨论了该模型允许的参数空间，该空间处于实验观测的阈值处。 我们发现这种$e'$DM 的起源需要在暴胀后较低的再加热温度，并且与通过轻子生成产生的重子不对称性一致，前提是镜像中微子具有显著的简并性。 最后，我们表明这种$e'$DM 与希格斯宇称不兼容，这是具有精确宇称的最简单方案，除非SM参数明显偏离其中心值或最小模型被扩展。 显示英文摘要

摘要： We study thermal production of dark matter (DM) in a realization of the minimal models of Ref.~\cite{Bonnefoy:2023afx}, where parity is used to solve the strong CP problem by transforming the entire Standard Model (SM) into a mirror copy. Although the mirror electron $e^{\prime}$ is a good DM candidate, its viability is mired by the presence of the mirror up-quark $u^{\prime}$, whose abundance is intimately related to the $e^{\prime}$ abundance and must be suppressed. This can be achieved through a sequential freeze-in mechanism, where mirror photons are first produced from SM gluons, and then the mirror photons produce $e'$. After computing the details of this double freeze-in, we discuss the allowed parameter space of the model, which lies at the threshold of experimental observations. We find that this origin of $e'$ DM requires a low reheating temperature after inflation and is consistent with the baryon asymmetry arising from leptogenesis, providing mirror neutrinos have a significant degeneracy. Finally, we show that this $e'$ DM is not compatible with Higgs Parity, the simplest scheme with exact parity, unless SM parameters deviate significantly from their central values or the minimal model is extended.