Quantum Gravity: A Fluctuating Point of View

Jan M. Pawlowski, Manuel Reichert*

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Abstrakt

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.

OriginalsprogEngelsk
Artikelnummer551848
TidsskriftFrontiers in Physics
Vol/bind8
Antal sider34
ISSN2296-424X
DOI
StatusUdgivet - feb. 2021

Bibliografisk note

Funding Information:
We thank A. Bonanno, B. B?rger, N. Christiansen, T. Denz, A. Eichhorn, K. Falls, H. Gies, A. Held, B. Knorr, P. Labus, S. Lippoldt, J. Meibohm, D. Litim, A. Pereira, A. Rodigast, B.-J. Schaefer, M. Schiffer, F. Saueressig, J. Smirnov, M. Yamada, and C. Wetterich for discussions and work on the subjects reported on.

Publisher Copyright:
© Copyright © 2021 Pawlowski and Reichert.

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

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