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Diluted axion star, a self-gravitating object with the quantum pressurebalancing gravity, has been predicted in many models with a QCD axion oraxion-like particle. It can be formed in the early universe and composes asizable fraction of dark matter. One could detect the transient radio signalswhen it passes by a magnetar with the axion particle converted into photon inthe magnetic field. Using both numerical and semi-analytic approaches, wesimulate the axion star's dynamic evolution and estimate the fraction of axionparticles that can have a resonance conversion during such a collision event.We have found that both self-gravity and quantum pressure are not importantafter the diluted axion star enters the Roche radius. A free-fall approximatecan capture individual particle trajectories very well. With some optimisticcosmological and astrophysical assumptions, the QCD axion parameter space canbe probed from detecting such a collision event by radio telescopes.

Diluted Axion Star Collisions with Neutron Stars