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SUMMARY:Generalized angular momentum and twistors - Simone Speziale (Centr
 e de Physique Théorique\, Marseille)
DTSTART:20240913T130000Z
DTEND:20240913T140000Z
UID:TALK219571@talks.cam.ac.uk
DESCRIPTION:In the early 80s Dray and Streubel showed that Penrose's twist
 orial formula for angular momentum at scri reproduces the canonical BMS ch
 arge whose flux is the Ashtekar-Streubel flux. In the last few years there
  has been growing interest in enlargements of the BMS algebra. One of this
  proposals includes the full set of diffeomorphisms of the cross sections 
 of scri\, and the corresponding charge is called generalized angular momen
 tum\, or super-Lorentz. We discuss the ambiguities of the new charge\, how
  the requirement of covariance tames them down\, and compare it to Penrose
 's twistorial description.
LOCATION:Seminar Room 1\, Newton Institute
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