Quantum Gravity: A Fluctuating Point of View

被引：45
作者：
Pawlowski, Jan M. [1 ,2 ]
Reichert, Manuel [3 ,4 ]
机构：
[1] Heidelberg Univ, Inst Theoret Phys, Heidelberg, Germany
[2] XtreMe Matter Inst EMMI, GSI Helmholtzzentrum Schwerionenforsch MbH, Darmstadt, Germany
[3] Univ Southern Denmark, CP3 Origins, Odense, Denmark
[4] Univ Sussex, Dept Phys & Astron, Brighton, E Sussex, England
来源：
FRONTIERS IN PHYSICS | 2021年 / 8卷
基金：
新加坡国家研究基金会;
关键词：
quantum gravity; asymptotic safety; background independence; diffeomorphism invariance; ward identities; YANG-MILLS THEORY; EXACT RENORMALIZATION-GROUP; MANIFESTLY GAUGE-INVARIANT; FLOW EQUATIONS; BRS SYMMETRY; ASYMPTOTIC SAFETY; SCALING SOLUTIONS; EINSTEIN GRAVITY; WILSONIAN FLOWS; ULTRAVIOLET PROPERTIES;
D O I：
10.3389/fphy.2020.551848
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
In this contribution, we discuss the asymptotic safety scenario for quantum gravity with a functional renormalization group approach that disentangles dynamical metric fluctuations from the background metric. We review the state of the art in pure gravity and general gravity-matter systems. This includes the discussion of results on the existence and properties of the asymptotically safe ultraviolet fixed point, full ultraviolet-infrared trajectories with classical gravity in the infrared, and the curvature dependence of couplings also in gravity-matter systems. The results in gravity-matter systems concern the ultraviolet stability of the fixed point and the dominance of gravity fluctuations in minimally coupled gravity-matter systems. Furthermore, we discuss important physics properties such as locality of the theory, diffeomorphism invariance, background independence, unitarity, and access to observables, as well as open challenges.
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页数：34
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