Quantum Gravity: A Fluctuating Point of View

Jan M. Pawlowski, Manuel Reichert*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

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.

Original languageEnglish
Article number551848
JournalFrontiers in Physics
Volume8
Number of pages34
ISSN2296-424X
DOIs
Publication statusPublished - Feb 2021

Keywords

  • asymptotic safety
  • background independence
  • diffeomorphism invariance
  • quantum gravity
  • ward identities

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