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arXiv 1601.01655gr-qc
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拓扑变化时空中的有限能量量子化

Finite energy quantization on a topology changing spacetime

S. Krasnikov

摘要:

“裤子”时空是一对扁平的2D圆柱体(“腿”)合并成一个单一的(“躯干”)。尽管这个时空很简单,但它有几个特征(特别是包括在“分叉”处的裸奇点),每一个都可能是非物理的,但没有一个已知的机制能够阻止它的发生。因此,研究量子场在这样的空间中的行为是非常有趣和重要的。安德森和德威特是第一个考虑裤子时空中自由标量场的人。他们认为,分叉奇点产生了无限明亮的闪光,这被解释为空间拓扑结构动态保持的证据。类似的分歧后来被Manogue,Copeland和Dray发现,他们使用了一种更奇特的量子化方案。后来,用一种稍有不同的方法得到了同样的结果,这使索尔金得出这样的结论:所讨论的拓扑跃迁在量子引力中受到抑制。在本文中,我表明,安德森-德威特分歧是一个人工制品,他们选择的福克空间。通过选择一个不同的单粒子希尔伯特空间,人们得到一个量子态,其中应力-能量张量(SET)的分量在自由落体观察者的框架中是有界的。

英文摘要:

The "trousers" spacetime is a pair of flat 2D cylinders ("legs") merging into into a single one ("trunk"). In spite of its simplicity this spacetime has a few features (including, in particular, a naked singularity in the "crotch") each of which is presumably unphysical, but for none of which a mechanism is known able to prevent its occurrence. Therefore it is interesting and important to study the behavior of the quantum fields in such a space. Anderson and DeWitt were the first to consider the free scalar field in the trousers spacetime. They argued that the crotch singularity produces an infinitely bright flash, which was interpreted as evidence that the topology of space is dynamically preserved. Similar divergencies were later discovered by Manogue, Copeland and Dray who used a more exotic quantization scheme. Later yet the same result obtained within a somewhat different approach led Sorkin to the conclusion that the topological transition in question is suppressed in quantum gravity. In this paper I show that the Anderson--DeWitt divergence is an artifact of their choice of the Fock space. By choosing a different one-particle Hilbert space one gets a quantum state in which the components of the stress-energy tensor (SET) are bounded in the frame of a free-falling observer.

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