Discretisations, Constraints and Diffeomorphisms in Quantum Gravity
Discretisations, Constraints and Diffeomorphisms in Quantum Gravity
In this review we discuss the interplay between discretization, constraint implementation, and diffeomorphism symmetry in Loop Quantum Gravity and Spin Foam models. To this end we review the Consistent Discretizations approach, which is an application of the master constraint program to construct the physical Hilbert space of the canonical theory, …