Quantum gravity: a fluctuating point of view
Abstract
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.
Cite
@article{arxiv.2007.10353,
title = {Quantum gravity: a fluctuating point of view},
author = {Jan M. Pawlowski and Manuel Reichert},
journal= {arXiv preprint arXiv:2007.10353},
year = {2021}
}
Comments
36 pages, 10 figures. Review of the fluctuation approach to asymptotically safe quantum gravity. v2: refs updated, matches journal version