Superrotations and Flat Space Holography
Sabrina Pasterski Perimeter Institute for Theoretical Physics
Collection
Talk Type
Scientific Series
Subject
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.