1.6k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- The University of Texas at AustinUS20 papers
- Center for Astrophysics Harvard & SmithsonianUS19 papers
- Princeton UniversityUS19 papers
- California Institute of TechnologyUS15 papers
- Instituto de Astrofísica de CanariasES15 papers
- Universidad de La LagunaES15 papers
- Centre National de la Recherche ScientifiqueFR14 papers
- Ames Research CenterUS13 papers
- Goddard Space Flight CenterUS13 papers
- Space Telescope Science InstituteUS13 papers
- The University of TokyoJP13 papers
- Vanderbilt UniversityUS13 papers
13 papers · 1 filter
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…
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…
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…
Gauge Fixing and Observables in General Relativity
D. C. Salisbury
The conventional group of four-dimensional diffeomorphisms is not realizeable as a canonical transformation group in phase space. Yet there is a larger field-dependent symmetry tra…
Quantum general invariance and loop gravity
Donald C. Salisbury
A quantum physical projector is proposed for generally covariant theories which are derivable from a Lagrangian. The projector is the quantum analogue of the integral over the gene…
Gauge symmetries in Ashtekar's formulation of general relativity
D. C. Salisbury, J. M. Pons, L. C. Shepley
It might seem that a choice of a time coordinate in Hamiltonian formulations of general relativity breaks the full four-dimensional diffeomorphism covariance of the theory. This is…
The gauge group in the real triad formulation of general relativity
J. M. Pons, D. C. Salisbury, L. C. Shepley
We construct explicitly generators of projectable four-dimensional diffeomorphisms and triad rotation gauge symmetries in a model of vacuum gravity where the fundamental dynamical…
Gauge Transformations in Einstein-Yang-Mills Theories
J. M. Pons, D. C. Salisbury, L. C. Shepley
We discuss the relation between spacetime diffeomorphisms and gauge transformations in theories of the Yang-Mills type coupled with Einstein's General Relativity. We show that loca…
Gauge group and reality conditions in Ashtekar's complex formulation of canonical gravity
J. M. Pons, D. C. Salisbury, L. C. Shepley
We discuss reality conditions and the relation between spacetime diffeomorphisms and gauge transformations in Ashtekar's complex formulation of general relativity. We produce a gen…
Gauge transformations in the Lagrangian and Hamiltonian formalisms of generally covariant theories
J. M. Pons, D. C. Salisbury, L. C. Shepley
We study spacetime diffeomorphisms in Hamiltonian and Lagrangian formalisms of generally covariant systems. We show that the gauge group for such a system is characterized by havin…
A Connection Approach to Numerical Relativity
D. C. Salisbury, L. C. Shepley
We discuss a general formalism for numerically evolving initial data in general relativity in which the (complex) Ashtekar connection and the Newman-Penrose scalars are taken as th…