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This is a comment on J. A. Barrett's article The Preferred-BasisProblem and the Quantum Mechanics of Everything ([2005]),which concerns theories postulating that certain quantum observableshave determinate values, corresponding to additional (oftencalled hidden) variables. I point out that itis far from clear, for most observables, what such a postulateis supposed to mean, unless the postulated additional variableis related to a clear ontology in space-time, such as particleworld lines, string world sheets, or fields. 相似文献
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