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GR: Fachverband Gravitation und Relativitätstheorie

GR 17: Quantum Gravity IV

GR 17.3: Talk

Friday, March 4, 2016, 11:55–12:15, VMP6 HS A

Asymptotic safety of gravity-matter systems — Jan Meibohm, Jan M. Pawlowski, and •Manuel Reichert — Institut für theoretische Physik, Universität Heidelberg

We study the ultraviolet stability of gravity-matter systems for general numbers of minimally coupled scalars and fermions. This is done within a functional renormalisation group setup. 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.