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SUMMARY:Celestial symmetries charges at null infinity from twistor space -
  Lionel Mason (University of Oxford)
DTSTART:20240916T133000Z
DTEND:20240916T143000Z
UID:TALK219697@talks.cam.ac.uk
DESCRIPTION:Celestial symmetry algebras arise from the OPEs of soft gravit
 ons giving rise to the so-called `Lw_{1+\\infty} algebra'. This talk will 
 explain how this algebra can be &nbsp\;can be understood as the local stru
 cture preserving local diffeomorphisms of twistor space. &nbsp\;This can b
 e naturally deformed to yield analogues with cosmological constant followi
 ng&nbsp\;https://arxiv.org/abs/2403.18011. &nbsp\;We also give a brief int
 roduction to twistor space actions to show how Noether arguments can be us
 ed to obtain improved associated charge and flux integrals at null infinit
 y as originally found by Friedel\, Pranzetti and Raclariu\; this is joint 
 work with Adam Kmec\, Romain Ruzziconi and &nbsp\;Akshay Yelleshpur-Srikan
 t&nbsp\;https://arxiv.org/abs/2407.04028. &nbsp\;If there is time there wi
 ll be some further open-ended discussion of open questions in celestial ho
 lography via twistor theory.
LOCATION:Seminar Room 2\, Newton Institute
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