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.
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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.