fphy-08-551848.pdf (3.03 MB)
Quantum gravity: a fluctuating point of view
journal contribution
posted on 2023-06-12, 09:59 authored by Jan M Pawlowski, Manuel ReichertIn 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.
Funding
Science and Technology Research Council; ST/T00102X/1
History
Publication status
- Published
File Version
- Published version
Journal
Frontiers in PhysicsISSN
2296-424XPublisher
Frontiers MediaExternal DOI
Volume
8Page range
1-34Article number
a551848Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Theoretical Particle Physics Research Group Publications
Full text available
- Yes
Peer reviewed?
- Yes