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The presence of a plethora of light spin 0 and spin 1 fields is motivated ina number of BSM scenarios, such as the axiverse. The study of the interactionsof such light bosonic fields with the Standard Model has focused mostly oninteractions involving only one such field, such as the axion ($\phi$) couplingto photons, $\phi F \tilde F$, or the kinetic mixing between photon and thedark photon, $ F F_D$. In this work, we continue the exploration ofinteractions involving two light BSM fields and the standard model, focusing onthe mixed axion-photon-dark-photon interaction $\phi F \tilde F_D$. If eitherthe axion or dark photon are dark matter, we show that this interaction leadsto conversion of the CMB photons into a dark sector particle, leading to adistortion in the CMB spectrum. We present the details of these uniquedistortion signatures and the resulting constraints on the $\phi F \tilde F_D$coupling. In particular, we find that for a wide range of masses, theconstraints from these effect are stronger than on the more widely studiedaxion-photon coupling.

CMB Spectral Distortions from an Axion-Dark Photon-Photon Interaction