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arXiv quant-ph/9905094quant-ph
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退相干历史与局部密度的涌现经典性

Decoherent Histories and the Emergent Classicality of Local Densities

J. J. Halliwell

摘要:

在背景下的退相干历史方法的量子理论,它表明,一类宏观配置的局部密度(数量,动量,能量)的历史组成的表现出可忽略不计的干扰。这是因为局域密度与相应的精确守恒量(也就是精确退相干量)密切相关,而且局域密度的本征态(在足够大的体积上取平均)在时间演化下仍然近似于本征态。这一结果与采用退相干历史方法推导流体动力学方程有关。

英文摘要:

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) exhibit 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.

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