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arXiv 2002.01693hep-thgr-qchep-lat
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几何量子理论中的重整化

Renormalization in quantum theories of geometry

J. Ambjorn, J. Gizbert-Studnicki, A. Goerlich, J. Jurkiewicz, R. Loll

摘要:

量子引力的非微扰理论的一个特点是没有固定的背景几何,因此在普朗克体系中没有任何先验定义的长度或尺度的概念。这对像威尔逊那样的重整化群方法的应用具有潜在的深远影响,威尔逊方法以关键的方式依赖于这些概念。本文综述了用因果动力学三角剖分(CDT)方法研究量子引力的现状,试图找到一个与晶格理论中观察到的二级相变相关的紫外不动点。测量目前唯一的不变相关器,即总空间三卷,没有产生任何证据,这样一个固定点。对这个结果的一个可能的解释是,我们对普朗克尺度附近的(量子)长度的适当概念的理解是不完整的,也许是天真的。

英文摘要:

A hallmark of non-perturbative theories of quantum gravity is the absence of a fixed background geometry, and therefore the absence in a Planckian regime of any notion of length or scale that is defined a priori. This has potentially far-reaching consequences for the application of renormalization group methods a la Wilson, which rely on these notions in a crucial way. We review the status quo of attempts in the Causal Dynamical Triangulations (CDT) approach to quantum gravity to find an ultraviolet fixed point associated with the second-order phase transitions observed in the lattice theory. Measurements of the only invariant correlator currently accessible, that of the total spatial three-volume, has not produced any evidence of such a fixed point. A possible explanation for this result is our incomplete and perhaps naive understanding of what constitutes an appropriate notion of (quantum) length near the Planck scale.

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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