The Semi-Classical Limit of Quantum Gravity on Corners

Abstract: We study quantum and classical systems defined by the quantum corner symmetry group $QCS = \widetilde{SL}(2,\mathbb{R}) \ltimes H_3$, which arises in the context of quantum gravity. In particular, we relate the quantum observables, defined by representation-theoretic data, to their classical counterparts through generalized Perelomov coherent states and the framework of Berezin quantization. The resulting procedure provides a mathematically well-defined notion of the semi-classical limit of quantum gravity, viewed as the representation theory of the corner symmetry group.