Effective universality in quantum gravity
Astrid Eichhorn, Peter Labus, Jan M. Pawlowski, Manuel Reichert
TL;DR
This paper explores the asymptotic safety scenario in quantum gravity with a scalar field, revealing that different quantum representations of the Newton coupling converge in the UV regime, indicating a form of effective universality.
Contribution
It demonstrates effective universality of the dynamical Newton coupling at the quantum level within a scalar-gravity system, highlighting a key property of the UV fixed point.
Findings
Quantum avatars of the Newton coupling agree quantitatively in the UV regime.
Background Newton coupling shows only qualitative agreement, not quantitative.
Supports the asymptotic safety scenario in quantum gravity with scalar matter.
Abstract
We investigate the asymptotic safety scenario for a scalar-gravity system. This system contains two avatars of the dynamical Newton coupling, a gravitational self-coupling and a scalar-graviton coupling. We uncover an effective universality for the dynamical Newton coupling on the quantum level: its momentum-dependent avatars are in remarkable quantitative agreement in the scaling regime of the UV fixed point. For the background Newton coupling, this effective universality is not present, but qualitative agreement remains.
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