Asymptotic safety in an interacting system of gravity and scalar matter

• Verfasst von: Donà, Pietro [VerfasserIn]
• Verfasst von: Eichhorn, Astrid [VerfasserIn]
• Titel: Asymptotic safety in an interacting system of gravity and scalar matter
• Verf.angabe: Pietro Donà, Astrid Eichhorn, Peter Labus, and Roberto Percacci
• Fussnoten: Phys. Rev. D 93, 044049 – Published 16 February 2016; Erratum Phys. Rev. D 93, 129904 (2016) ; Gesehen am 21.11.2017
• Titel Quelle: Enthalten in: Physical review
• Jahr Quelle: 2016
• Band/Heft Quelle: 93(2016,4) Artikel-Nummer 044049, 15 Seiten
• ISSN Quelle: 2470-0029
• DOI: doi:10.1103/PhysRevD.93.044049
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1565581822

Abstract

Asymptotic safety is an attractive scenario for the dynamics of quantum spacetime. Here, we work from a phenomenologically motivated point of view and emphasize that a viable dynamics for quantum gravity in our Universe must account for the existence of matter. In particular, we explore the scale dependence of a scalar matter-gravity vertex, and investigate whether an interacting fixed point exists for the so-defined Newton coupling. We find a viable fixed point in the pure-gravity system, disregarding scalar quantum fluctuations. We explore its extensions to the case with dynamical scalars, and find indications of asymptotic safety in the matter-gravity system. We moreover examine the anomalous dimensions for different components of the metric fluctuations, and find significant differences between the transverse traceless and scalar component.