At the mini-superspace level, Einstein-Hilbert gravity and Weyl-Dirac gravity are governed by the same Hartle-Hawking wave function, with the scale factor a replaced by the in-scalar aφ for any Brans-Dicke parameter.
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Mini-Superspace Universality and No-Scale Quantum Cosmology
At the mini-superspace level, Einstein-Hilbert gravity and Weyl-Dirac gravity are governed by the same Hartle-Hawking wave function, with the scale factor a replaced by the in-scalar aφ for any Brans-Dicke parameter.