On the representation theory of the Bondi-Metzner-Sachs group and its variants in three space-time dimensions

Understand

The original Bondi-Metzner-Sachs (BMS) group B is the common asymptotic symmetry group of all asymptotically flat Lorentzian radiating 4-dim space-times.

• As such, B is the best candidate for the universal symmetry group of General Relativity (G.R.).
• In 1973, with this motivation, P.
• J.