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SUMMARY:Ringdown amplitudes in extreme mass ratio inspiral - Shahar Hadar 
 (The Hebrew University of Jerusalem)
DTSTART:20121123T130000Z
DTEND:20121123T140000Z
UID:TALK39642@talks.cam.ac.uk
CONTACT:Ian A. Morrison
DESCRIPTION:An extreme mass ratio inspiral terminates when the small compa
 ct\nobject plunges into the large black hole (BH) it orbited. Its trajecto
 ry\,\nhence also the emitted gravitational waveform\, starts (quite) unive
 rsally from the innermost stable circular orbit. Next\, the binary merges 
 and the final black hole rings down until it reaches steady state. In this
  stage the geometry constitutes an open resonant cavity for gravitational 
 perturbations\, which are described by quasinormal modes (QNMs). For a plu
 nge into non-rotating BHs\, I present (semi-) analytical results for the Q
 NM ringdown amplitudes and hence the late time waveform\, and successfully
  compare to amplitudes extracted from numerical waveforms. For near-extrem
 al Kerr BHs\, I present analytical results for the amplitudes\, excited in
  the highly symmetric near-horizon region. I show part of the computation 
 can be carried out at exact extremality and carried to near-extremality by
  diffeomorphism.
LOCATION:Pavilion B Potter Room (B1.19)
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