Vilenkin has explained his procedure in detail.30 His method of restricting superspace by imposing carefully chosen boundary conditions on the Wheeler-DeWitt equation does result in a more or less unique solution to the equation. The resulting universal wave function ψ does include a universe like ours as a probable observation. Consequently, quantum cosmologists regard such an outcome as an explanation of the origin of the universe, indeed, as an explanation of the universe “from nothing,” as Krauss puts it. Nevertheless, the specific universal wave function ψ that “explains” the origin of
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