Superrotations and Flat Space Holography


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


Pasterski, Sabrina. Superrotations and Flat Space Holography. Perimeter Institute, Oct. 30, 2018, https://pirsa.org/18100085


          @misc{ pirsa_PIRSA:18100085,
            doi = {10.48660/18100085},
            url = {https://pirsa.org/18100085},
            author = {Pasterski, Sabrina},
            keywords = {Quantum Fields and Strings},
            language = {en},
            title = {Superrotations and Flat Space Holography},
            publisher = {Perimeter Institute},
            year = {2018},
            month = {oct},
            note = {PIRSA:18100085 see, \url{https://pirsa.org}}

Sabrina Pasterski Perimeter Institute for Theoretical Physics


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.