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PIRSA:18100085

Superrotations and Flat Space Holography

APA

Pasterski, S. (2018). Superrotations and Flat Space Holography. Perimeter Institute. https://pirsa.org/18100085

Sabrina Pasterski Perimeter Institute for Theoretical Physics

Talk numberPIRSA:18100085

Abstract

We consider implications of superrotations as an asymptotic symmetry of asymptotically flat spacetimes.  Beginning with a review of the rich structure of interconnections between soft theorems, asymptotic symmetries, and                 memory effects, we describe the superrotation iteration.  The subleading soft graviton theorem can be cast as a Ward identity for this asymptotic symmetry in 4D, and also as one for the stress tensor of a putative CFT2.  We detail the change of scattering basis motivated by this asymptotic symmetry and discuss recent progress.