Enhanced Conformal BMS3 Algebra from Extended 3D Conformal Gravity
An infinite-dimensional nonlinear symmetry algebra obtained as the asymptotic symmetry of Pope and Townsend's extension of three-dimensional conformal gravity, which couples an extra spin-2 field. With appropriate boundary conditions the canonical generators close into a nonlinear W(2,2,2,2,1,1,1) algebra whose central extensions are fixed by the Virasoro central charge; since its wedge algebra is SO(4,2), it also gives an infinite-dimensional nonlinear extension of the AdS5 algebra.
2501.00439
This paper constructs an enhanced version of the conformal BMS3 algebra, the infinite-dimensional symmetry algebra that governs the asymptotic structure of conformal gravity in three dimensions. Star…