On harvesting physical predictions from asymptotically safe quantum field theories

TL;DR

This paper introduces a new analytical approach to extract physical predictions from asymptotically safe quantum field theories, demonstrated on the 2D Ising model and applicable to broader theories.

Contribution

It presents a novel method using analytical and pseudo-spectral techniques to determine the UV-critical surface in asymptotic safety, advancing the understanding of microscopic dynamics.

Findings

Successfully applied to the 2D Ising model

Generalizable to other asymptotically safe theories

Advances the foundation for quantum gravity research

Abstract

Asymptotic safety is a powerful mechanism for obtaining a consistent and predictive quantum field theory beyond the realm of perturbation theory. It hinges on an interacting fixed point of the Wilsonian renormalization group flow which controls the microscopic dynamics. Connecting the fixed point to observations requires constructing the set of effective actions compatible with this microscopic dynamics. Technically, this information is stored in the UV-critical surface of the fixed point. In this work, we describe a novel approach for extracting this information based on analytical and pseudo-spectral methods. Our construction is illustrated at the level of the two-dimensional Ising model and easily generalizes to any asymptotically safe quantum field theory. It also constitutes an important step towards setting up a well-founded swampland program within the gravitational asymptotic safety program.