Summary
We solve the Wheeler-DeWitt equation in the WKB expansion by using heat kernel regularization. We discuss higher-orders contribution in the WKB expansion. We also discuss the renormalization group equation for real and complex wave functions.
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Horiguchi, T. WKB expansion and renormalizability of the Wheeler-DeWitt equation: higher-orders contribution. Nuov Cim B 111, 293–325 (1996). https://doi.org/10.1007/BF02724653
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DOI: https://doi.org/10.1007/BF02724653