Dark Photon Dark Matter Radio Signal from the Milky Way Electron Density

TL;DR

This paper explores the potential radio signals generated by interactions between dark photon dark matter and electrons in the Milky Way, assessing detectability with current and future radio telescopes like ALMA and SKA.

Contribution

It introduces a novel method to detect dark photon dark matter through radio signals resulting from electron interactions, expanding the search for dark matter.

Findings

ALMA and SKA can probe new dark photon parameter space

Radio signals from dark photons are potentially detectable

Unconstrained dark photon masses can be explored

Abstract

We consider Thomson-like processes between dark matter dark photons and free electrons in the Milky Way. The result is a radio signal background that can be detectable with current or future radio telescope arrays. In particular, we computed sensitivity prospects for the Atacama Large Millimeter Array (ALMA) radio telescope and for the future Square Kilometer Array (SKA), concluding that unconstrained parameter space in a wide range of dark photon masses can be probed.