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SUMMARY:Linear waves on extremal black holes - Dejan Gajic (DAMTP)
DTSTART:20160226T130000Z
DTEND:20160226T140000Z
UID:TALK64004@talks.cam.ac.uk
CONTACT:43345
DESCRIPTION:Extremal Kerr black holes are members of the Kerr family of sp
 acetimes that rotate at a maximum angular velocity. The goal of this talk 
 is to shed some light on stability properties of extremal Kerr black holes
  and the nature of singularities in extremal black hole interiors by consi
 dering the simplified dynamical problem of the scalar wave equation on fix
 ed Kerr backgrounds. It turns out that the behaviour of scalar fields on e
 xtremal black holes differs dramatically with their behaviour on more slow
 ly rotating backgrounds. I will present recent instability results in the 
 exterior of extremal black holes and their impact on late-time polynomial 
 tails of the scalar field\, which is joint work with Y. Angelopoulos and S
 . Aretakis. I will also discuss recent stability results on extremal black
  hole interiors\, which show that in the context of scalar fields\, the in
 ner horizons in extremal black holes are less violent than in their more s
 lowly rotating counterparts.
LOCATION:Pavilion B Potter Room (B1.19)
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