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SUMMARY:Zero-damped Modes and Nearly Extremal Horizons - Jason Joykutty (D
 AMTP)
DTSTART:20220429T120000Z
DTEND:20220429T130000Z
UID:TALK173693@talks.cam.ac.uk
CONTACT:Prahar Mitra
DESCRIPTION:Quasinormal modes are the gravitational wave analogue to the o
 vertones heard after striking a bell. They dominate the signal observed du
 ring the ringdown phase after a dynamical event and are characterised by c
 omplex frequencies\, which encode oscillation and exponential decay in tim
 e. As horizons become extremal\, various computations (both analytic and n
 umerical) have shown that in many cases\, there exists a sequence of frequ
 encies which become purely oscillatory in the limit and which cluster on a
  line in the complex plane. These are zero-damped modes and are conjecture
 d to exist generically for near-extremal horizons. In this talk\, we shall
  discuss results that can be obtained toward resolving this question\; for
  example\, one can show that these modes do arise for the conformal Klein-
 Gordon equation on a class of spherically symmetric black hole spacetimes.
LOCATION:Potter room
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