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arXiv · 2311.00702

Dark Matter in A Mirror Solution to the Strong CP Problem

Quentin Bonnefoy·Lawrence Hall·Claudio Andrea Manzari·Amara McCune·Christiane Scherb
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Abstract

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.

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Quentin Bonnefoy, Lawrence Hall, Claudio Andrea Manzari, Amara McCune, Christiane Scherb. 2023-11-01. Dark Matter in A Mirror Solution to the Strong CP Problem. https://arxiv.org/abs/2311.00702

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