# Fermionic Fixed-Point Structure of Asymptotically Safe QED with a Pauli Term

Source: [Fermionic Fixed-Point Structure of Asymptotically Safe QED with a Pauli Term](<https://www.sota2.com/research/paper/68fa467b1e209131ce9208ac>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-28T13:54:45.452Z

Authors: Holger Gies, Kevin K. K. Tam

Published: 2024-03-05T13:59:20.000Z

## Abstract

We test the physical viability of a recent proposal for an asymptotically safe modification of quantum electrodynamics (QED), whose ultraviolet physics is dominated by a non-perturbative Pauli spin-field coupling. We focus in particular on its compatibility with the absence of dynamical generation of fermion mass in QED. Studying the renormalization group flow of chiral four-fermion operators and their fixed points, we discover a distinct class of behavior compared to the standard picture of fixed-point annihilation at large gauge couplings and the ensuing formation of chiral condensates. Instead, transcritical bifurcations, where the fixed points merely exchange infrared stability, are observed. Provided that non-chiral operators remain irrelevant, our theory accommodates a universality class of light fermions for $N\_{\\text{f}} \> 1$ irreducible Dirac flavors. On the contrary, in the special case of $N\_{\\text{f}} = 1$ flavor, this comes only at the expense of introducing one additional relevant parameter.

## Recorded benchmark results

A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage.

## Original sources and implementation

[Original paper](<https://arxiv.org/abs/2403.02980>)

[PDF](<https://arxiv.org/pdf/2403.02980.pdf>)