Critical reflections on asymptotically safe gravity

Alfio Bonanno, Astrid Eichhorn*, Holger Gies, Jan M. Pawlowski, Roberto Percacci, Martin Reuter, Frank Saueressig, Gian Paolo Vacca

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

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 quantumspacetime 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.

Original languageEnglish
Article number269
JournalFrontiers in Physics
Volume8
Number of pages30
ISSN2296-424X
DOIs
Publication statusPublished - Aug 2020

Keywords

  • Asymptotic safety
  • Effective field theory
  • Observables
  • Quantum gravitation
  • Renormalization group
  • Running couplings
  • Unitarity

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