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arXiv 1608.05941gr-qc
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2+1维Dirac场Fock量子化的唯一性

Uniqueness of the Fock quantization of Dirac fields in 2+1 dimensions

Jerónimo Cortez, Beatriz Elizaga Navascués, Mercedes Martín-Benito, Guillermo A. Mena Marugán, José M. Velhinho

摘要:

本文研究了2+1维共形超静定背景中自由狄拉克场的Fock量子化,其中共形因子随时间变化。由于它是典型的场论,在规范反对易关系的Fock表示中存在无限的歧义。不同的选择可能会导致描述不同物理的酉不等价理论。为了消除这种模糊性,人们通常要求真空在实现运动方程对称性的酉变换下是不变的。然而,在非平稳背景中,时间平移不是对称变换,真空不变性的要求一般不足以完全固定Fock表示。我们表明,这个问题是克服在所考虑的情况下,要求,此外,一个unitarily实现量子动力学。这些条件的组合施加选择了一个独特的家庭的等效福克表示。此外,人们还获得了狄拉克场的时间变化本质上唯一的分裂,分裂为对背景标度因子的显式依赖性以及相应的产生和湮灭算符的量子演化。

英文摘要:

We study the Fock quantization of a free Dirac field in 2+1-dimensional backgrounds which are conformally ultrastatic, with a time-dependent conformal factor. As it is typical for field theories, there is an infinite ambiguity in the Fock representation of the canonical anticommutation relations. Different choices may lead to unitarily inequivalent theories that describe different physics. To remove this ambiguity one usually requires that the vacuum be invariant under the unitary transformations that implement the symmetries of the equations of motion. However, in non-stationary backgrounds, where time translation is not a symmetry transformation, the requirement of vacuum invariance is in general not enough to fix completely the Fock representation. We show that this problem is overcome in the considered scenario by demanding, in addition, a unitarily implementable quantum dynamics. The combined imposition of these conditions selects a unique family of equivalent Fock representations. Moreover, one also obtains an essentially unique splitting of the time variation of the Dirac field into an explicit dependence on the background scale factor and a quantum evolution of the corresponding creation and annihilation operators.

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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