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arXiv 1203.3591hep-thgr-qchep-lat
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非微扰量子引力

Nonperturbative Quantum Gravity

J. Ambjorn, A. Goerlich, J. Jurkiewicz, R. Loll

摘要:

渐近安全性描述了这样一种情况,即广义相对论可以被量化为传统的场论,尽管当围绕固定的背景几何展开时,它是不可重正化的。它是在威尔逊重整化群的框架下制定的,并依赖于紫外线不动点的存在,这一点的证据已被发现使用重整化群方程在连续。“因果动力三角剖分”(CDT)是一个具体的研究计划,通过格点正则化获得引力的非微扰量子场论,并表示为时空历史的总和。在威尔逊的精神下,人们可以用这个公式来试图定位格点理论的不动点,从而为UV不动点的存在提供独立的、非微扰的证据。我们描述的形式主义的CDT,它的相图,可能的不动点和“量子几何”出现在不同的阶段。我们还认为,形式主义可能能够描述一类更一般的Hoenava-Lifshitz引力模型。

英文摘要:

Asymptotic safety describes a scenario in which general relativity can be quantized as a conventional field theory, despite being nonrenormalizable when expanding it around a fixed background geometry. It is formulated in the framework of the Wilsonian renormalization group and relies crucially on the existence of an ultraviolet fixed point, for which evidence has been found using renormalization group equations in the continuum. "Causal Dynamical Triangulations" (CDT) is a concrete research program to obtain a nonperturbative quantum field theory of gravity via a lattice regularization, and represented as a sum over spacetime histories. In the Wilsonian spirit one can use this formulation to try to locate fixed points of the lattice theory and thereby provide independent, nonperturbative evidence for the existence of a UV fixed point. We describe the formalism of CDT, its phase diagram, possible fixed points and the "quantum geometries" which emerge in the different phases. We also argue that the formalism may be able to describe a more general class of Hořava-Lifshitz gravitational models.

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