Extrinsic Time in Quantum Cosmology

Details Extrinsic Time in Quantum Cosmology Extrinsic Time in Quantum Cosmology

1994-09-14

arxiv.org/abs/gr-qc/9409032v2

Phys.Rev. D52 (1995) 1963-1969

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

14 pages (TeX manuscript). Revised and enlarged version

Scientific paper

10.1103/PhysRevD.52.1963

An extrinsic time is identified in most isotropic and homogeneous cosmological models by matching them with the ideal clock - a parametrized system whose only "degree of freedom" is time -. Once this matching is established, the cosmological models are quantized in the same way as the ideal clock. The space of solutions of the Wheeler-DeWitt equation is turned out into a Hilbert space by inserting a time dependent operator in the inner product, yielding a unitary theory equivalent to the phase space reduced theory.

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