Universal Corner Symmetry and the Orbit Method for Gravity

Understand

A universal symmetry algebra organizing the gravitational phase space has been recently found.

• It corresponds to the subset of diffeomorphisms that become physical at corners -- codimension-$2$ surfaces supporting Noether charges.
• It applies to both finite distance and asymptotic corners.
• In this paper, we study this algebra and its representations, via the coadjoint orbit method.