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1. General Covariance

   Linked via "Energy Constraint"

   Relation to Diffeomorphism Constraints
   Within canonical quantization schemes, such as those utilizing Ashtekar variables, the requirement of general covariance manifests directly as a set of constraints on the phase space of the gravitational field. The Diffeomorphism Constraint, alongside the Hamiltonian Constraint (or Energy Constraint), arises precisely because the coordinate freedom (the […