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SUMMARY:Holographic aspects of gravity in four and three dimensions - Glen
 n Barnich (ULB)
DTSTART:20141204T130000Z
DTEND:20141204T140000Z
UID:TALK54900@talks.cam.ac.uk
CONTACT:Godazgar
DESCRIPTION:After a brief review of the symmetry groups for asymptotically
  AdS and flat spacetimes\, I will discuss in some detail the status of the
  four dimensional flat case. In particular\, I will explain why current al
 gebras need to replace the more traditional algebra of ADM-type charges an
 d briefly comment on the relation to soft theorems. \n\nIn three dimension
 s\, more results are available. In particular\, the complete solution spac
 e is entirely controlled by group theory\, the coadjoint representation of
  the Virasoro group in the AdS case and of the BMS3 group in the flat case
 . This allows one for instance to prove positive energy theorems by using 
 well-established results on the classification of coadjoint orbits of the 
 Virasoro group.
LOCATION:Potter Room (first floor\, Pav. B)
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