Critical Reflections on Asymptotically Safe Gravity

Asymptotic safety is a theoretical proposal for the ultraviolet completion of quantum field theories, in particular for quantum gravity. Significant progress on this program has led to a first characterization of the Reuter fixed point. Further advancement in our understanding of the nature of quant...

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Bibliographic Details
Published inFrontiers in physics Vol. 8
Main Authors Bonanno, Alfio, Eichhorn, Astrid, Gies, Holger, Pawlowski, Jan M., Percacci, Roberto, Reuter, Martin, Saueressig, Frank, Vacca, Gian Paolo
Format Journal Article
LanguageEnglish
Published Frontiers Media S.A 03.08.2020
Subjects
asymptotic safety
effective field theory
observables
quantum gravitation
renormalization group
running couplings
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Summary:Asymptotic safety is a theoretical proposal for the ultraviolet completion of quantum field theories, in particular for quantum gravity. Significant progress on this program has led to a first characterization of the Reuter fixed point. Further advancement in our understanding of the nature of quantum spacetime requires addressing a number of open questions and challenges. Here, we aim at providing a critical reflection on the state of the art in the asymptotic safety program, specifying and elaborating on open questions of both technical and conceptual nature. We also point out systematic pathways, in various stages of practical implementation, toward answering them. Finally, we also take the opportunity to clarify some common misunderstandings regarding the program.
ISSN:2296-424X
2296-424X
DOI:10.3389/fphy.2020.00269