Zobrazeno 1 - 10
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pro vyhledávání: '"SALISBURY, D."'
Autor:
Srivastava, P., Brooks, I. M., Prytherch, J., Salisbury, D. J., Renfrew, I. A., Elvidge, A. D., Yelland, M. J.
Publikováno v:
Boundary-Layer Meteorology; Nov2024, Vol. 190 Issue 11, p1-13, 13p
Akademický článek
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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 extension, the canonical formulation of generally covariant theories. We id
Externí odkaz:
http://arxiv.org/abs/1001.2726
Publikováno v:
Phys.Rev.D80:084015,2009
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 equivalent to a choice of intrinsically defined coordinates accomplishe
Externí odkaz:
http://arxiv.org/abs/0905.4564
Publikováno v:
Mod.Phys.Lett.A24:725-732,2009
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 relation to the symmetry group of diffeomorphism transformations has re
Externí odkaz:
http://arxiv.org/abs/0902.0401
Autor:
Salisbury, D. C., Schmitz, A.
A temporally discrete Schroedinger time evolution equation is proposed for isotropic quantum cosmology coupled to a massless scalar source. The approach employs dynamically determined intrinsic time and produces the correct semiclassical limit.
Externí odkaz:
http://arxiv.org/abs/gr-qc/0702132
Autor:
Salisbury, D. C.
In a paper appearing in Annalen der Physik in 1930 Leon Rosenfeld invented the first procedure for producing Hamiltonian constraints. He displayed and correctly distinguished the vanishing Hamiltonian generator of time evolution, and the vanishing ge
Externí odkaz:
http://arxiv.org/abs/physics/0701299
Autor:
Salisbury, D. C.
Peter Bergmann was a co-inventor of the algorithm for converting singular Lagrangian models into a constrained Hamiltonian dynamical formalism. This talk focuses on the work of Bergmann and his collaborators in the period from 1949 to 1951.
Comm
Comm
Externí odkaz:
http://arxiv.org/abs/physics/0608067
Autor:
Pons, J. M., Salisbury, D. C.
Publikováno v:
Phys.Rev. D71 (2005) 124012
Diffeomorphism-induced symmetry transformations and time evolution are distinct operations in generally covariant theories formulated in phase space. Time is not frozen. Diffeomorphism invariants are consequently not necessarily constants of the moti
Externí odkaz:
http://arxiv.org/abs/gr-qc/0503013
Publikováno v:
Gen.Rel.Grav.40:1475-1498,2008
Intrinsic time-dependent invariants are constructed for classical, flat, homogeneous, anisotropic cosmology with a massless scalar material source. Invariance under the time reparameterization-induced canonical symmetry group is displayed explicitly.
Externí odkaz:
http://arxiv.org/abs/gr-qc/0503014