Asymptotic safety of gravity-matter systems
TL;DR: In this paper, the ultraviolet stability of gravity-matter systems for general numbers of minimally coupled scalars and fermions was studied under the functional renormalization group setup put forward in [N. Christiansen, B. Knorr, M. Meibohm, J. M. Pawlowski, and M. Reichert.
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Abstract: We study the ultraviolet stability of gravity-matter systems for general numbers of minimally coupled scalars and fermions. This is done within the functional renormalization group setup put forward in [N. Christiansen, B. Knorr, J. Meibohm, J. M. Pawlowski, and M. Reichert, Phys. Rev. D 92, 121501 (2015).] for pure gravity. It includes full dynamical propagators and a genuine dynamical Newton's coupling, which is extracted from the graviton three-point function. We find ultraviolet stability of general gravity-fermion systems. Gravity-scalar systems are also found to be ultraviolet stable within validity bounds for the chosen generic class of regulators, based on the size of the anomalous dimension. Remarkably, the ultraviolet fixed points for the dynamical couplings are found to be significantly different from those of their associated background counterparts, once matter fields are included. In summary, the asymptotic safety scenario does not put constraints on the matter content of the theory within the validity bounds for the chosen generic class of regulators.
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Citations
Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A ∗
TL;DR: In this article , a wide range of well-motivated deviations from classical general relativity (GR) BH solutions are investigated using the Event Horizon Telescope (EHT) observations of Sagittarius A ∗ (Sgr A ∆ ), connecting the size of the bright ring of emission to that of the underlying BH shadow.
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The nonperturbative functional renormalization group and its applications
N. Dupuis,Léonie Canet,Astrid Eichhorn,Astrid Eichhorn,W. Metzner,Jan M. Pawlowski,Matthieu Tissier,Nicolás Wschebor +7 more
TL;DR: The nonperturbative functional renormalization-group (FRG) approach as discussed by the authors is a modern implementation of Wilson's RG, which allows one to set up nonperturative approximation schemes that go beyond the standard perturbative RG approaches.
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An asymptotically safe guide to quantum gravity and matter
TL;DR: Asymptotic safety generalizes asymptotics and could contribute to understanding physics beyond the standard model as discussed by the authors, and it is a candidate scenario to provide an ultraviolet extension for the effective quantum field theory of gravity through an interacting fixed point of the Renormalization Group.
The nonperturbative functional renormalization group and its applications
N. Dupuis,Léonie Canet,Astrid Eichhorn,Astrid Eichhorn,W. Metzner,Jan M. Pawlowski,Matthieu Tissier,Nicolás Wschebor +7 more
TL;DR: The nonperturbative functional renormalization-group (FRG) approach as discussed by the authors is a modern implementation of Wilson's RG, which allows one to set up nonperturative approximation schemes that go beyond the standard perturbative RG approaches.
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Critical reflections on asymptotically safe gravity
Alfio Bonanno,Astrid Eichhorn,Astrid Eichhorn,Holger Gies,Jan M. Pawlowski,Roberto Percacci,Martin Reuter,Frank Saueressig,Gian Paolo Vacca +8 more
TL;DR: Asymptotic safety is a theoretical proposal for the ultraviolet completion of quantum field theories, in particular for quantum gravity as discussed by the authors, and significant progress on this program has led to a first characterization of the Reuter fixed point.
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