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arXiv · 2408.03370

Adiabatic Conversion of ALPs into Dark Photon Dark Matter

Edward Broadberry·Saurav Das·Anson Hook·Gustavo Marques-Tavares
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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.

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Edward Broadberry, Saurav Das, Anson Hook, Gustavo Marques-Tavares. 2024-08-06. Adiabatic Conversion of ALPs into Dark Photon Dark Matter. https://doi.org/10.1007/jhep03(2025)215

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