Dark inverse Compton scattering of cosmic-ray electrons and positrons on ultralight dark photon dark matter produces a sub-MHz radio background that, compared with IMP-6, RAE-2, and Parker Solar Probe data, constrains the kinetic mixing below about 2e-6 for masses below 2e-17 eV.
Dark Photon Dark Matter Radio Signal from the Milky Way Electron Density
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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.
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Sub-MHz Radio Background from Ultralight Dark Photon Dark Matter
Dark inverse Compton scattering of cosmic-ray electrons and positrons on ultralight dark photon dark matter produces a sub-MHz radio background that, compared with IMP-6, RAE-2, and Parker Solar Probe data, constrains the kinetic mixing below about 2e-6 for masses below 2e-17 eV.