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Forums
Physics
Quantum Physics
Collapse and unitary evolution
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[QUOTE="PaleMoon, post: 6032420, member: 647294"] i think that [URL='http://en.wikipedia.org/wiki/Wigner%27s_friend']wigner's friend[/URL] provides an argument against objective collapse. when wigner chooses something to be measured there is a quantum object in a spacetime region outside him. wigner himself is not a quantum object. suppose that there is a collapse in this spacetime region. wigner's friend can do another choice and include wigner as a quantum object in a larger spacetime region for him wigner is in a superposition and collapse could occur later when he will decide to do delayed measurement may be collapse is observer dependent whereas unitarity is more fundamental [/QUOTE]
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Collapse and unitary evolution
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