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arXiv 1504.07656hep-thgr-qc
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四维量子Einstein引力的一个恰当的固定泛函

A proper fixed functional for four-dimensional Quantum Einstein Gravity

Maximilian Demmel, Frank Saueressig, Omar Zanusso

摘要:

实现基于渐近安全的引力量子理论取决于理论的重整化群流的非高斯不动点的存在。本文利用有效平均作用量的泛函重整化群方程,在泛函水平上研究了包含无限多个尺度依赖的耦合常数的量子爱因斯坦引力的不动点.我们制定了一个列表的指导原则的建设偏微分方程编码的尺度依赖的$f(R)$ -重力。我们发现,这个方程承认一个唯一的,全球良好定义的固定功能描述的非高斯不动点的标量曲率的功能的水平。这个解决方案是通过一个数值双射击方法明确构建。在紫外线,这个解决方案是在良好的协议,包括有限数量的耦合常数多项式展开的结果,而它的比例$R^2$,打扮与非解析条款,在IR。我们证明,其结构主要是由流动方程的保形部门。我们的工作以前的关系,类似的缩放解决方案的部分建设进行了讨论。

英文摘要:

Realizing a quantum theory for gravity based on Asymptotic Safety hinges on the existence of a non-Gaussian fixed point of the theory's renormalization group flow. In this work, we use the functional renormalization group equation for the effective average action to study the fixed point underlying Quantum Einstein Gravity at the functional level including an infinite number of scale-dependent coupling constants. We formulate a list of guiding principles underlying the construction of a partial differential equation encoding the scale-dependence of $f(R)$-gravity. We show that this equation admits a unique, globally well-defined fixed functional describing the non-Gaussian fixed point at the level of functions of the scalar curvature. This solution is constructed explicitly via a numerical double-shooting method. In the UV, this solution is in good agreement with results from polynomial expansions including a finite number of coupling constants, while it scales proportional to $R^2$, dressed up with non-analytic terms, in the IR. We demonstrate that its structure is mainly governed by the conformal sector of the flow equation. The relation of our work to previous, partial constructions of similar scaling solutions is discussed.

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