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We study thermal production of dark matter (DM) in a realization of theminimal models of Ref.\cite{Bonnefoy:2023afx}, where parity is used to solvethe strong CP problem by transforming the entire Standard Model (SM) into amirror 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 besuppressed. This can be achieved through a sequential freeze-in mechanism,where mirror photons are first produced from SM gluons, and then the mirrorphotons produce $e'$. After computing the details of this double freeze-in, wediscuss the allowed parameter space of the model, which lies at the thresholdof experimental observations. We find that this origin of $e'$ DM requires alow reheating temperature after inflation and is consistent with the baryonasymmetry arising from leptogenesis, providing mirror neutrinos have asignificant degeneracy. Finally, we show that this $e'$ DM is not compatiblewith Higgs Parity, the simplest scheme with exact parity, unless SM parametersdeviate significantly from their central values or the minimal model isextended.

Dark Matter in A Mirror Solution to the Strong CP Problem