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SUMMARY:Black hole superradiance of interacting multi-fields
DTSTART;VALUE=DATE-TIME:20260810T075500Z
DTEND;VALUE=DATE-TIME:20260810T082000Z
DTSTAMP;VALUE=DATE-TIME:20260913T142545Z
UID:indico-contribution-2678@indico.itp.ac.cn
DESCRIPTION:Speakers: Jun Zhang (International Center for Theoretical Phys
 ics Asia-Pacific)\nUltralight bosonic fields can undergo exponential ampli
 fication around rotating black holes through black hole superradiance. Thi
 s process can result in black hole spin-down\, continuous gravitational-wa
 ve emission\, and many other observable consequences\, providing a powerfu
 l probe of dark particles in the strong-gravity regime. In particular\, th
 e LVK Collaboration has placed constraints on dark scalars with masses aro
 und $10^{-12}$ eV.\n\nWhile most existing studies assume a single field\, 
 the dark sector may contain multiple particle species with nontrivial inte
 ractions. In this work\, we investigate black hole superradiance in the pr
 esence of multiple interacting fields. In particular\, we compute the corr
 ections to the superradiant growth rates induced by interactions with othe
 r fields\, study the nonlinear evolution of the superradiant system\, and 
 discuss the observational implications.\n\nWe find that interactions can s
 ignificantly suppress black hole superradiance and modify the superradiant
  evolution\, even if the coupled field is not itself superradiant. We demo
 nstrate that multi-field interactions can qualitatively alter superradianc
 e phenomenology and should be incorporated when deriving robust constraint
 s on the dark sector from black hole spin measurements and gravitational-w
 ave observations.\n\nhttps://indico.itp.ac.cn/event/416/contributions/2678
 /
LOCATION:Conference Center (2F) Front Area
URL:https://indico.itp.ac.cn/event/416/contributions/2678/
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