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arXiv 2205.09147gr-qchep-thquant-ph
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超越半经典时间

Beyond semiclassical time

Leonardo Chataignier

摘要:

我们证明了在量子引力中通常使用的Born-Oppenheimer型近似,其中半经典时间参数来自于Wheeler-DeWitt约束的弱耦合展开,导致了在小超空间模型中至少达到次领先阶的幺正理论。由于不存在违反么正性的项,这解决了在这个顺序下的么正性问题,这个问题在文献中有很多争论。此外,我们还表明,保守的内积是规范固定的意义上说,该措施是相关的Faddeev-Popov行列式与半经典时间的选择作为一个重新参数化规范。这意味着,玻恩-奥本海默对时间问题的处理方法实际上是关系量子理论的一个实例,其中跃迁振幅可以与条件概率相关。

英文摘要:

We show that the usual Born-Oppenheimer type of approximation used in quantum gravity, in which a semiclassical time parameter emerges from a weak-coupling expansion of the Wheeler-DeWitt constraint, leads to a unitary theory at least up to the next-to-leading order in minisuperspace models. As there are no unitarity-violating terms, this settles the issue of unitarity at this order, which has been much debated in the literature. Furthermore, we also show that the conserved inner product is gauge-fixed in the sense that the measure is related to the Faddeev-Popov determinant associated with the choice of semiclassical time as a reparametrization gauge. This implies that the Born-Oppenheimer approach to the problem of time is, in fact, an instance of a relational quantum theory, in which transition amplitudes can be related to conditional probabilities.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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