Universality and the approach to the continuum limit in lattice gauge theory

TL;DR

This paper investigates the universality of the continuum limit in SU(2) lattice gauge theory by computing non-perturbative couplings across energies, confirming universality and highlighting careful use of perturbation theory at high energies.

Contribution

It provides non-perturbative tests of universality and continuum extrapolation in lattice gauge theory, with detailed analysis of renormalized couplings.

Findings

Universality confirmed at all energies within a few percent.

Continuum limit extrapolation performed using lattice sequences with decreasing spacings.

Perturbation theory requires careful application when matching couplings at high energies.

Abstract

The universality of the continuum limit and the applicability of renormalized perturbation theory are tested in the SU(2) lattice gauge theory by computing two different non-perturbatively defined running couplings over a large range of energies. The lattice data (which were generated on the powerful APE computers at Rome II and DESY) are extrapolated to the continuum limit by simulating sequences of lattices with decreasing spacings. Our results confirm the expected universality at all energies to a precision of a few percent. We find, however, that perturbation theory must be used with care when matching different renormalized couplings at high energies.