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arXiv 2302.14152hep-thgr-qc
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量子引力中的泛函重整化群

The Functional Renormalization Group in Quantum Gravity

Frank Saueressig

摘要:

引力渐近安全计划设想通过一个相互作用的重整化群不动点,即引力不动点,来完成引力相互作用的高能化。研究这种情况的主要工具是泛函重整化群方程,最重要的是韦特里希方程。这个方程实现了威尔逊重整化群的思想,通过在动量空间中一层一层地积分量子涨落,并在微扰论的范围之外获得了理论的重整化群流。这一章给出了一个教学介绍引力渐近安全计划,特别侧重于澄清概念点,导致在过去的混乱。我们逐步介绍韦特里奇方程及其最常用的非微扰近似。本文还介绍了最近的发展,包括最小基本方案和$N$型截断。使用的Wetterich方程在显式计算中说明内的Einstein-Hilbert截断构成最简单的非微扰近似的引力重整化群流。最后,我们简要总结和评论最近的发展起源于其他量子引力计划。

英文摘要:

The gravitational asymptotic safety program envisions a high-energy completion of the gravitational interactions by an interacting renormalization group fixed point, the Reuter fixed point. The primary tool for investigating this scenario are functional renormalization group equations, foremost the Wetterich equation. This equation implements the idea of the Wilsonian renormalization group by integrating out quantum fluctuations shell-by-shell in momentum space and gives access to the theory's renormalization group flow beyond the realm of perturbation theory. This chapter gives a pedagogical introduction to the gravitational asymptotic safety program with a specific focus on clarifying conceptual points which led to confusion in the past. We provide a step-by-step introduction to the Wetterich equation and its most commonly used non-perturbative approximations. This exposition also introduces recent developments including the minimal essential scheme and $N$-type cutoffs. The use of the Wetterich equation in explicit computations is illustrated within the Einstein-Hilbert truncation which constitutes the simplest non-perturbative approximation of the gravitational renormalization group flow. We conclude with a brief summary and comments on recent developments originating from other quantum gravity programs.

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