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arXiv · 2501.17234

Freezing-in the Pure Dark Axion Portal

Paola Arias·Bastián Díaz Sáez·Joerg Jaeckel
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Abstract

A $Z_2$ symmetry under which "dark'' and "visible'' fields transform differently can further seclude already dark particles. In a dark sector consisting of an axion-like particle and a dark photon the dominant interaction can then be via a dark photon-axion portal to the ordinary photon. If the axion is lighter than the dark photon it naturally emerges as a viable dark matter candidate. We explore its freeze-in production both in a standard high reheating temperature and weak coupling as well as a low reheating temperature and strong coupling regime. Cosmological constraints are taken into account to identify viable regions in parameter space. For the strong freeze-in regime, we highlight the possibility of probing it at B-factories. We also briefly discuss a potential misalignment contribution to the dark matter density and delineate under which conditions it can be neglected.

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Paola Arias, Bastián Díaz Sáez, Joerg Jaeckel. 2025-01-28. Freezing-in the Pure Dark Axion Portal. https://doi.org/10.1088/1475-7516%2F2025%2F06%2F060

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