Abstract
A definition for the intrinsic time co-ordinate is proposed, using the phase of the wave function of the universe. This definition generalizes the notion of time co-ordinate which arises in the semiclassical cosmology. It also leads to acceptable results for the evaluation of expectation values of physical variables.
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Padmanabhan, T. A definition for time in quantum cosmology. Pramana - J Phys 35, L199–L204 (1990). https://doi.org/10.1007/BF02875295
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DOI: https://doi.org/10.1007/BF02875295