The gravitational S-matrix from the path integral: asymptotic symmetries and soft theoremsConfirmed

by Per Kraus

Tuesday May 5, 2026, 9:30 AM → 11:00 AM America/Toronto

PI/4-405 - Bob Room (Perimeter Institute for Theoretical Physics)

The classical action, or more generally the path integral, is a convenient framework for extracting the physical consequences of symmetries. In recent years, new symmetries of gravity in asymptotically flat spacetime have been uncovered based on relations to soft theorems governing the S-matrix. I will discuss a program to understand these symmetries using a formulation in which the S-matrix is identified with the action subject to asymptotic boundary conditions. This formulation of the S-matrix is analogous to the GKP/W formulation of the AdS/CFT duality and shares many of its advantages, albeit with new subtleties due to working in asymptotically flat spacetime.