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Decoherent Histories and the Emergent Classicality of Local Densities

Decoherent Histories and the Emergent Classicality of Local Densities,10.1103/PhysRevLett.83.2481,Physical Review Letters,J. J. Halliwell

Decoherent Histories and the Emergent Classicality of Local Densities   (Citations: 7)
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In the context of the decoherent histories approach to quantum theory, it is shown that a class of macroscopic configurations consisting of histories of local densities (number, momentum, energy) exhibits negligible interference. This follows from the close connection of the local densities with the corresponding exactly conserved (and so exactly decoherent) quantities, and also from the observation that the eigenstates of local densities (averaged over a sufficiently large volume) remain approximate eigenstates under time evolution. The result is relevant to the derivation of hydrodynamic equations using the decoherent histories approach.
Journal: Physical Review Letters - PHYS REV LETT , vol. 83, no. 13, pp. 2481-2485, 1999
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