Theory Seminar: Blagoje Oblak, ETH

Mon, 04/16/2018 - 2:10pm
Pupin Hall Theory Center, 8th Floor

"Berry Phases of Boundary Gravitons"

Blagoje Oblak

Eidgenössische Technische Hochschule (ETH), Zurich

This talk is devoted to Berry phases that appear in unitary representations of asymptotic symmetry groups in general relativity. These phases arise when a coherent state is acted upon by symmetry transformations that trace a closed path in the group manifold, and they can be evaluated exactly even when the group is infinite-dimensional. We apply these ideas to the Virasoro and BMS groups; seeing their representations as particles dressed with boundary gravitons, the associated Berry phases generalize Thomas precession and provide, in principle, observable signatures of asymptotic symmetries.