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SUMMARY:Accreting axion stars in our galaxy: parametric resonance and bose
 nova
DTSTART;VALUE=DATE-TIME:20260415T060000Z
DTEND;VALUE=DATE-TIME:20260415T070000Z
DTSTAMP;VALUE=DATE-TIME:20260408T200200Z
UID:indico-event-4898@indico-tdli.sjtu.edu.cn
DESCRIPTION:Speakers: Hyeonseok Seong (香港科技大学)\n\nAbstract: Ax
 ions are promising dark matter candidates that may form substructures\, su
 ch 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 criti
 cal axion star mass determined by either axion-photon coupling or axion se
 lf-interaction. We consider continuous accretion of these critical axion s
 tars and their subsequent emission of radio waves or relativistic axions. 
 In the case of radio emissions\, the abundance of axion stars and their ne
 arly monochromatic signals provide a distinctive opportunity to search for
  axions against radio backgrounds. We find that axion-photon coupling arou
 nd 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 rela
 tivistic axion flux offers interesting prospects for detection in axion da
 rk matter experiments.Biography: Dr. Seong received his Ph.D. from the Kor
 ea Advanced Institute of Science and Technology (KAIST) in 2021. He subseq
 uently held postdoctoral positions at the Institute for Basic Science (202
 1–2022)\, DESY (2022–2025)\, and since 2025\, he has been a postdoctor
 al researcher at HKUST. His research focuses on particle physics and cosmo
 logy beyond the Standard Model\, with a particular emphasis on axions点
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 4898/
LOCATION:Tsung-Dao Lee Institute/N6F-N601 - Meeting Room (Tsung-Dao Lee In
 stitute)
URL:https://indico-tdli.sjtu.edu.cn/event/4898/
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