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SUMMARY:Testing the Kerr hypothesis: the examples of synchronisation and s
 calarisation - Carlos Herdeiro\, Aveiro University
DTSTART:20200304T141500Z
DTEND:20200304T151500Z
UID:TALK137617@talks.cam.ac.uk
CONTACT:Francesca Chadha-Day
DESCRIPTION:The Kerr hypothesis is that astrophysical black hole candidate
 s are very special objects\, with only two degrees of freedom and well des
 cribed by the Kerr metric. Theoretically\, this hypothesis is based on the
  uniqueness theorems for electro-vacuum. But in the presence of other type
 s of matter or modified gravity are there any viable alternatives? In this
  talk I will illustrate some (families of) examples of black holes with "h
 air" that could co-exist with Kerr black holes\, but emerge dynamically (a
 nd be preferred) at particular scales\, either in General Relativity with 
 ultralight bosonic matter or in modified gravity with higher curvature cor
 rections\, commenting on their theoretical and phenomenological difference
 s (e.g. shadows) and on their phenomenological viability. If time permits 
 I shall also illustrate a generic obstruction to black hole mimickers that
  emerge from incomplete gravitational collapse. 
LOCATION:MR2\, Centre for Mathematical Sciences
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