Abstract
We derive exact series solutions for the Wheeler–DeWitt equation corresponding to a spatially closed Friedmann–Robertson–Walker universe with cosmological constant for arbitrary operator ordering of the scale factor of the universe. The resulting wave functions are those relevant to the approximation which has been widely used in two-dimensional minisuperspace models with an inflationary scalar field for the purpose of predicting the period of inflation which results from competing boundary condition proposals for the wave function of the universe. The problem that Vilenkin's tunneling wave function is not normalizable for general operator orderings, is shown to persist for other values of the spatial curvature, and when additional matter degrees of freedom such as radiation are included.
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Wiltshire, D.L. Wave Functions for Arbitrary Operator Ordering in the de Sitter Minisuperspace Approximation. General Relativity and Gravitation 32, 515–528 (2000). https://doi.org/10.1023/A:1001932502138
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DOI: https://doi.org/10.1023/A:1001932502138