Speaker
Asaad Elkhidir
Description
On-shell methods have found a new application to local observables
such as asymptotic radiation fields and gravitational waveforms. While these
observables are invariant under small gauge transformations, they are known to
depend on a choice of asymptotic gauge; in gravity on asymptotically Minkowski
spacetimes, this is a choice of BMS frame. In this talk, I will describe a
method for capturing these supertranslations, to all orders in perturbation
theory, using the on-shell framework of scattering amplitudes.
