162 citations · 522 across the 26 of their papers we have counts for
16 papers · 1 filter
A new approach to classical Einstein-Yang-Mills Theory
Donald Salisbury
The conventional Rosenfeld-Bergmann-Dirac constrained Hamiltonian algorithm applied to Einstein-Yang-Mills theory is shown to be equivalent to a local gauge theoretic extension of…
Restoration of four-dimensional diffeomorphism covariance in canonical general relativity: An intrinsic Hamilton-Jacobi approach
Donald Salisbury, Jürgen Renn, Kurt Sundermeyer
Classical background independence is reflected in Lagrangian general relativity through covariance under the full diffeomorphism group. We show how this independence can be maintai…
Observables in classical canonical gravity: folklore demystified
J. M. Pons, D. C. Salisbury, K. A. Sundermeyer
We give an overview of some conceptual difficulties, sometimes called paradoxes, that have puzzled for years the physical interpetation of classical canonical gravity and, by exten…
Revisiting observables in generally covariant theories in the light of gauge fixing methods
J. M. Pons, D. C. Salisbury, K. A. Sundermeyer
We derive for generally covariant theories the generic dependency of observables on the original fields, corresponding to coordinate-dependent gauge fixings. This gauge choice is e…
Gravitational observables, intrinsic coordinates, and canonical maps
J. M. Pons, D. C. Salisbury, K. A. Sundermeyer
It is well known that in a generally covariant gravitational theory the choice of spacetime scalars as coordinates yields phase-space observables (or "invariants"). However their r…
A generalized Schroedinger equation for loop quantum cosmology
D. C. Salisbury, A. Schmitz
A temporally discrete Schroedinger time evolution equation is proposed for isotropic quantum cosmology coupled to a massless scalar source. The approach employs dynamically determi…