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SUMMARY:Superradiant scattering by a black hole binary - Leong Khim Wong (
 University of Cambridge)
DTSTART:20190510T120000Z
DTEND:20190510T130000Z
UID:TALK122803@talks.cam.ac.uk
CONTACT:Nathan Johnson-McDaniel
DESCRIPTION:I present a novel type of superradiance that arises in black h
 ole binary spacetimes. Given the right initial conditions\, a wave will un
 dergo amplification when it scatters off the binary. This process is fuell
 ed by the extraction of energy from the binary’s orbital motion\, so doe
 s not rely on the spins of the constituent black holes. Despite the inhere
 nt complexity of such a system\, analytic results can be obtained in the l
 imit where large hierarchies of scales are present\; a limit for which an 
 effective field theory (EFT) approach is ideally suited. In this talk\, we
  will discuss how the general EFT for black holes interacting with externa
 l fields is constructed before applying it specifically to study superradi
 ance.
LOCATION:Pavilion B Potter Room (B1.19)
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