Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2010-10-22
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
Revtex4 Class, 3 pages, No Figures
Scientific paper
In the present work we consider Friedmann-Robertson-Walker models in the presence of a stiff matter perfect fluid and a cosmological constant. We write the superhamiltonian of these models using the Schutz's variational formalism. We notice that the resulting superhamiltonians have terms that will lead to factor ordering ambiguities when they are written as operators. In order to remove these ambiguities, we introduce appropriate coordinate transformations and prove that these transformations are canonical using the symplectic method.
Corrêa Silva E. V.
Ferreira Filho L. G.
Monerat G. A.
Neves Clifford
Oliveira-Neto G.
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