Freezing-in the Pure Dark Axion Portal
Paola Arias, Basti\'an D\'iaz S\'aez, Joerg Jaeckel

TL;DR
This paper investigates the freeze-in production of a dark matter candidate in a dark sector with an axion-like particle and dark photon, considering different cosmological regimes and potential experimental probes.
Contribution
It introduces a novel analysis of dark matter production via a dark photon-axion portal, including cosmological constraints and experimental prospects.
Findings
Viable dark matter parameter space identified.
Potential detection at B-factories discussed.
Conditions for neglecting misalignment contribution outlined.
Abstract
A 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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Taxonomy
TopicsDark Matter and Cosmic Phenomena · Cosmology and Gravitation Theories · Galaxies: Formation, Evolution, Phenomena
