Parametrizing fluids in canonical quantum gravity
| dc.creator | Montani, Giovanni | |
| dc.creator | Zonetti, Simone | |
| dc.date | 2008-07-12 | |
| dc.date.accessioned | 2026-07-07T11:33:57Z | |
| dc.date.available | 2026-07-07T11:33:57Z | |
| dc.description | The problem of time is an unsolved issue of canonical General Relativity. A possible solution is the Brown-Kuchar mechanism which couples matter to the gravitational field and recovers a physical, i.e. non vanishing, observable Hamiltonian functional by manipulating the set of constraints. Two cases are analyzed. A generalized scalar fluid model provides an evolutionary picture, but only in a singular case. The Schutz' model provides an interesting singularity free result: the entropy per baryon enters the definition of the physical Hamiltonian. Moreover in the co-moving frame one is able to identify the time variable tau with the logarithm of entropy. | |
| dc.description | 5 pages, no figures. Proceeding of the II Stueckelberg Workshop, Pescara, Sept. 2007 | |
| dc.identifier | https://arxiv.org/abs/0807.1982 | |
| dc.identifier | http://arxiv.org/abs/0807.1982 | |
| dc.identifier | Int.J.Mod.Phys.A23:1240-1243,2008 | |
| dc.identifier | doi:10.1142/S0217751X08040147 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/198081 | |
| dc.subject | General Relativity and Quantum Cosmology | |
| dc.title | Parametrizing fluids in canonical quantum gravity | |
| dc.type | text |