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

Dark matter seeping through dynamic gauge kinetic mixing