Adiabatic Conversion of ALPs into Dark Photon Dark Matter

Abstract

We introduce a mechanism by which a misaligned ALP can be dynamically converted into a dark photon in the presence of a background magnetic field. An abundance of non-relativistic ALPs will convert to dark photons with momentum of order the inhomogeneities in the background field; therefore a highly homogeneous field will produce non-relativistic dark photons without relying on any redshifting of their momenta. Taking hidden sector magnetic fields produced by a first order phase transition, the mechanism can reproduce the relic abundance of dark matter for a wide range of dark photon masses down to $10^{-13}$ eV.

23 pages, 8 figures. Updated in line with journal version

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Cited by in corpus (3)

• Freezing-in the Pure Dark Axion Portal
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• Probing the Axion-Photon-Dark Photon Interaction at Future $e^{+}{e}^{-}$ Colliders