1210.0731 (Glenn Barnich et al.)

BMS_3 invariant two dimensional field theories as flat limit of
Liouville    [PDF]

Glenn Barnich, Andrés Gomberoff, Hernán A. González

In the gravitational context, Liouville theory is the two-dimensional conformal field theory that controls the boundary dynamics of asymptotically AdS_3 spacetimes at the classical level. By taking a suitable limit of the coupling constants of the Hamiltonian formulation of Liouville, we construct and analyze a BMS_3 invariant two-dimensional field theory that is likely to control the boundary dynamics at null infinity of three dimensional asymptotically flat gravity.

View original: http://arxiv.org/abs/1210.0731