Phys. Rev. D 50, 2581–2594 (1994)Approaches to quantum cosmologyReceived 14 March 1994; published in the issue dated 15 August 1994 Different proposals for the wave function of the Universe are analyzed, with an emphasis on various forms of the tunneling proposal. The issues discussed include the equivalence of the Lorentzian path integral and outgoing-wave-proposals, the definitions of the outgoing waves and of superspace boundaries, topology change, and the corresponding modification of the Wheeler-DeWitt equation. Also discussed are the ‘‘generic’’ boundary condition and the third quantization approach. © 1994 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.50.2581
DOI:
10.1103/PhysRevD.50.2581
PACS:
98.80.Hw, 04.60.Gw
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