2024/01/12 by Paul Romatschke, Romatschke, Paul
Physics and Astronomy · #Quantum Chromodynamics and Particle Interactions #Black Holes and Theoretical Physics #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.2401.06847
Perturbative renormalization provides the bedrock of understanding quantum field theories. In this work, I point out an alternative way of renormalizing quantum field theories, which is naturally encountered and well known for the case of large N scalar field theories. In terms of bare parameters, this non-perturbative alternative renormalization differs qualitatively from its perturbative cousin: in the continuum limit, the bare coupling constant goes to zero instead of infinity, and there is no wave-function counterterm. Despite these differences, the resulting n-point functions of the theory are finite. I provide explicit results for alternative renormalization for the O(N) model and QCD with Nf=12 flavors in 3+1 dimensions.