Originally posted by Kbertsche
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That's exactly what Vilenkin refers to; the "universe" is the "entire connected spacetime region", and excludes any hypothetical universes which are disconnected from ours.
His quantum tunnelling argument is described by the laws of quantum mechanics and, for him, "nothing" would be subject to these laws, i.e. the universe appears from an empty geometry (i.e. “nothing”).
https://mukto-mona.com/science/physi...om_nothing.pdf
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