Extrinsic Time in Quantum Cosmology
arXiv:gr-qc/9409032 · doi:10.1103/PhysRevD.52.1963
Abstract
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.
14 pages (TeX manuscript). Revised and enlarged version
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