Dark matter seeping through dynamic gauge kinetic mixing

Abstract

We show for the first time that the loop-driven kinetic mixing between visible and dark Abelian gauge bosons can facilitate dark matter production in the early Universe by creating a 'dynamic' portal, which depends on the energy of the process. The required smallness of the strength of the portal interaction, suited for freeze-in, is justified by a suppression arising from the mass of a heavy vector-like fermion. The strong temperature sensitivity associated with the interaction is responsible for most of the dark matter production during the early stages of reheating.

arXiv comment15 pages, 4 figures; clarifications added in text, appendix added, references updated; accepted for publication in JCAP

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• The case for decaying spin-3/2 dark matter
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• Cosmologically Varying Kinetic Mixing
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• FIMP Dark Matter in Clockwork/Linear Dilaton Extra-Dimensions
• Conformal Portal to Dark Matter
• Metastable Conformal Dark Matter
• Collider fingerprints of freeze-in dark matter produced during the fast expansion phase of Universe
• Dark matter cooling during early matter-domination boosts sub-earth halos
• Fingerprints of freeze-in dark matter in an early matter-dominated era