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We investigate the potential of the Square Kilometre Array (SKA) in detectingsynchrotron radiation emitted from the decay of sub-GeV dark matter (darkmatter with masses below the GeV scale) in the presence of strong magneticfields. As a concrete setup, we consider scenarios where the magnetosphere of amagnetic white dwarf overlaps with dense dark matter environments, such asthose surrounding a primordial black hole. Our study reveals that theencounters of compact objects such as white dwarfs and black holes offer apromising avenue for upcoming radio telescopes to probe the properties of lightdark matter, which has been less explored compared with more conventionalheavier (masses above the GeV scale) dark matter.

SKA Sensitivity to Sub-GeV Dark Matter Decay: Synchrotron Radio Emissions in White Dwarf Magnetospheres