Abstract
By extending geometrodynamical phase space by embeddings and their conjugate momenta, one can homomorphically map the Lie algebra of space-time diffeomorphisms into the Poisson algebra of dynamical variables on the extended phase space.
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Kuchař, K.V. Canonical geometrodynamics and general covariance. Found Phys 16, 193–208 (1986). https://doi.org/10.1007/BF01889472
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DOI: https://doi.org/10.1007/BF01889472