Papers › Transient Radio Signatures from Neutron Star Encounters with QCD Axion Miniclusters

Transient Radio Signatures from Neutron Star Encounters with QCD Axion Miniclusters

10 Nov 2020arXiv:2011.05378links table onlyarchive 2025-07-28

Thomas D. P. Edwards, Bradley J. Kavanagh, Luca Visinelli, Christoph Weniger

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The QCD axion is expected to form dense structures known as axion miniclusters if the Peccei-Quinn symmetry is broken after inflation. Miniclusters that have survived until today will interact with neutron stars (NSs) in the Milky Way to produce transient radio signals from axion-photon conversion in the NS magnetosphere. We quantify the properties of these encounters and find that they occur frequently (𝒪(1-100) day⁻¹); last between a day and a few months; are spatially clustered towards the Galactic center; and can reach observable fluxes. These radio transients are within reach of current generation telescopes and therefore offer a promising pathway to discovering QCD axion dark matter.

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