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SUMMARY:Strong-Field Dynamics and Multimessenger Signatures of Ultralight 
 Dark Matter
DTSTART;VALUE=DATE-TIME:20260810T082000Z
DTEND;VALUE=DATE-TIME:20260810T084500Z
DTSTAMP;VALUE=DATE-TIME:20260824T165428Z
UID:indico-contribution-2679@indico.itp.ac.cn
DESCRIPTION:Speakers: Yifan Chen (Tsung-Dao Lee Institute)\nUltralight bos
 ons near compact objects can form gravitationally bound states\, some of w
 hich grow exponentially by extracting black hole rotational energy or thro
 ugh relaxation from ambient waves. These states can reach field amplitudes
  approaching the Planck scale\, leading to non-perturbative phenomena anal
 ogous to early-universe cosmology and to observational signatures far stro
 nger than those from local dark matter detection\, including electromagnet
 ic features in black hole imaging and gravitational-wave imprints of the s
 urrounding environment. Two examples of strong-field phenomena will be dis
 cussed. First\, accreting axion clouds can enter a saturation regime in wh
 ich the field approaches the decay constant\, with relativistic axion emis
 sion balancing the accretion and encoding the underlying self-interactions
 . Second\, high-energy neutrinos propagating through a dense scalar backgr
 ound with non-diagonal couplings can undergo parametric resonance\, leadin
 g to distortions in the observed flavor ratios.\n\nhttps://indico.itp.ac.c
 n/event/416/contributions/2679/
LOCATION:Conference Center (2F) Front Area
URL:https://indico.itp.ac.cn/event/416/contributions/2679/
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