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Axion Miniclusters in the Milky Way

SourceSeminar Date of Publication:May 20,2022
05/20 2022 Seminar
  • Title Axion Miniclusters in the Milky Way
  • Speaker Luca Visinelli (Tsung-Dao Lee Institute)
  • Date 2022年5月20日 15:00
  • Venue 会议号:889 4173 3817 密码:826990
  • Abstract

      Abstract: Axion miniclusters (AMCs) are relatively dense, gravitationally bound clumps of dark matter (DM) QCD axions. AMCs have intriguing observational consequences for Earth-based axion detectors, for DM substructure searches with microlensing, and for radio signatures from AMC encounters with neutron stars (NSs). However, the properties of AMCs in the Milky Way may be drastically altered by tidal interactions with ordinary stars. We present Monte Carlo simulations following the evolution of AMCs orbiting in the Milky Way, which can be used to estimate the properties of AMCs throughout the Galaxy today and can be easily recast. We use this information as a key ingredient in estimating the rate, duration, flux, and sky locations of radio signals from axion-photon conversion due to NS encounters with AMCs. The resulting radio transients are within reach of current and future radio telescopes, opening a new avenue for detecting QCD axion DM.