On the Possibility That the Present Quantum State of the Universe is the Vacuum

It is inquired how much an observer can ascertain of the quantum state of a system of which he and his measuring apparatus form a part; how much, for example, observers like ourselves can ascertain of the quantum state of the Universe. It turns out that no practicable experiment (and: perhaps, no experiment whatever) can establish that that state is not the vacuum. Some of the implications of this curious result are discussed.
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Michael Redhead (1994). The Vacuum in Relativistic Quantum Field Theory. PSA: Proceedings of the Biennial Meeting of the Philosophy of Science Association 1994:77 - 87.

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