Asymptotic Symmetries of Gauge and Gravity Theories in Minkowski Space

We argue that the infinite-dimensional BMS symmetry discovered by Bondi et. al in the 60s provides an exact symmetry of the quantum gravity S-matrix. The Ward identity of this symmetry is shown to be precisely Weinberg's soft graviton theorem, also discovered in the 60s. A parallel infinite-dimensional symmetry is found to be generated in nonabelian gauge theories by gauge transformations which go to an angle-dependent finite constant at null infinity. The Ward identity of this symmetry is shown to be the soft gluon theorem.

Event Type: 
Seminar
Collection/Series: 
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Event Date: 
Jeudi, Mars 13, 2014 - 13:00 to 14:30
Location: 
Space Room