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SUMMARY:Termination of Black Hole Superradiance from a Binary Companion - 
 Xi Tong\, University of Cambridge
DTSTART:20231006T120000Z
DTEND:20231006T130000Z
UID:TALK207556@talks.cam.ac.uk
CONTACT:Xi Tong
DESCRIPTION:Black hole superradiance instability is an old topic studied e
 xtensively in the context of astrophysics\, gravity and dark matter. A rot
 ating black hole grows a cloud of massive bosons via superradiance instabi
 lity\, forming a Gravitational Atom (GA). Many interesting phenomena of th
 e GA assumes its isolation. In this talk\, however\, I would like to empha
 size the importance of a binary companion and its impact on the GA phenome
 nology. We will see that the tidal perturbation from a binary can suppress
 \, and even terminate the process of superradiance. This effect poses stro
 ng constraints on the GA resonant transitions\, while relaxing the ultrali
 ght boson mass bound from gravitational wave null detections. We also disc
 uss observing the backreaction effects and how the boson cloud can resist 
 the termination effect by modulating binary orbital parameters.
LOCATION:Potter room/Zoom
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