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gr-qc2005
The issue of time in generally covariant theories and the Komar-Bergmann approach to observables in general relativity
J. M. Pons, D. C. Salisbury
Diffeomorphism-induced symmetry transformations and time evolution are distinct operations in generally covariant theories formulated in phase space. Time is not frozen. Diffeomorp…
gr-qc2005
Reparameterization invariants for anisotropic Bianchi I cosmology with a massless scalar source
D. C. Salisbury, J. Helpert, A Schmitz
Intrinsic time-dependent invariants are constructed for classical, flat, homogeneous, anisotropic cosmology with a massless scalar material source. Invariance under the time repara…