On the Various Extensions of the BMS Group

Understand

The Bondi-Metzner-Sachs-van der Burg (BMS) group is the asymptotic symmetry group of radiating asymptotically flat spacetimes.

• It has recently received renewed interest in the context of the flat holography and the infrared structure of gravity.
• In this thesis, we investigate the consequences of considering extensions of the BMS group in four dimensions with superrotations.
• In particular, we apply the covariant phase space methods on a class of first order gauge theories that includes the Cartan formulation of general relativity and specify this analysis to gravity in asymptotically flat spacetime.