Accreting axion stars in our galaxy: parametric resonance and bosenova

by Dr Hyeonseok Seong (香港科技大学)

Wednesday 15 Apr 2026, 14:00 → 15:00 Asia/Shanghai

Tsung-Dao Lee Institute/N6F-N601 - Meeting Room (Tsung-Dao Lee Institute)

Abstract: Axions are promising dark matter candidates that may form substructures, such as miniclusters and axion stars, existing within our galaxy. Based on the mass distribution of miniclusters, we derive the mass distribution of axion stars and examine the abundance of axion stars that reach the critical axion star mass determined by either axion-photon coupling or axion self-interaction. We consider continuous accretion of these critical axion stars and their subsequent emission of radio waves or relativistic axions. In the case of radio emissions, the abundance of axion stars and their nearly monochromatic signals provide a distinctive opportunity to search for axions against radio backgrounds. We find that axion-photon coupling around or even below ~1e-12/GeV can be probed for axion masses ranging from 1e-7 eV to 1e-2 eV, by using ongoing or upcoming radio telescopes, namely, LOFAR, FAST, ALMA, and SKA. In the case of bosenova events, the relativistic axion flux offers interesting prospects for detection in axion dark matter experiments.
Biography: Dr. Seong received his Ph.D. from the Korea Advanced Institute of Science and Technology (KAIST) in 2021. He subsequently held postdoctoral positions at the Institute for Basic Science (2021–2022), DESY (2022–2025), and since 2025, he has been a postdoctoral researcher at HKUST. His research focuses on particle physics and cosmology beyond the Standard Model, with a particular emphasis on axions

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