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SUMMARY:Black holes and stars as particle detectors - Richard Brito (IST/L
 isbon)  
DTSTART:20150424T120000Z
DTEND:20150424T130000Z
UID:TALK59099@talks.cam.ac.uk
CONTACT:Benson Way
DESCRIPTION:Superradiance is a very generic process involving dissipative 
 systems\,\nwhereby energy is\ntransferred from one medium to another\, typ
 ically stimulated by wave\nscattering. Various mechanisms (as diverse as m
 assive\nfields\, magnetic fields\, anti-de Sitter boundaries\, nonlinear\n
 interactions\, etc...) can confine the amplified radiation and give\nrise 
 to strong instabilities. Linear studies of the instability have\nbeen used
  to impose strong constraints on ultralight bosons around\nrotating black 
 holes\, turning black holes into particle detectors. In\nthis talk I will 
 describe the most recent developments on this\nsubject. In particular I wi
 ll describe how the instability develops in\nthe presence of accretion and
  gravitational-wave emission and will\nshow that even stars can become sup
 erradiantly unstable once\nappropriate dissipation mechanisms are included
 .
LOCATION:Pavilion B Potter Room (B1.19)
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