Supertranslations are Soft Dressings

Abstract: In quantum field theories, the definition of a single particle state is ambiguous when there is no mass gap. I will discuss how this ambiguity, for a single massive particle and in the regime of validity of the classical approximation, is intimately connected to large gauge transformations of classical theories. I will in particular discuss BMS supertranslations from this point of view, as well as consequences for classical observables such as gravitational waveforms.

The link to join the seminar online is https://meet.google.com/nkv-azgs-ufs