Asymptotic safety in an interacting system of gravity and scalar matter

Understand

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.