String Theory seminar - Alok Laddha [NOTE UNUSUAL DAY: TUESDAY] Seminar

Abstract: In recent years, there has been a flurry of activity in analysing the infra-red (IR) sector of Quantum Gravity in asymptotically flat spacetimes . A remarkable structure appears to emerge from these studies which relates (classical) soft radiation, quantum soft graviton theorems and asymptotic symmetry of classical and quantum S Matrix. First such structure was discovered by Pasterski and Strminger and is called infra-red triangle . It reveals the universality in the IR sector . In this talk, we will review some of the recent progress in identifying a hierarchy of these infra-red triangles and their implications for complete set of asymptotic symmetries of Quantum Gravity S matrix.