Quantum gravity: a fluctuating point of view
In this contribution, we discuss the asymptotic safety scenario for quantum gravity with a functional renormalisation 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 inc...
Gespeichert in:
| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
24 February 2021
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| In: |
Frontiers in physics
Year: 2021, Jahrgang: 8, Pages: 1-34 |
| ISSN: | 2296-424X |
| DOI: | 10.3389/fphy.2020.551848 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.3389/fphy.2020.551848 Verlag, lizenzpflichtig, Volltext: https://www.frontiersin.org/articles/10.3389/fphy.2020.551848/full 
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| Verfasserangaben: | Jan M. Pawlowski and Manuel Reichert |
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| 520 | |a In this contribution, we discuss the asymptotic safety scenario for quantum gravity with a functional renormalisation 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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