Gauge action improvement and smearing
Stephan D\"urr
TL;DR
This paper investigates how different gauge actions and smearing techniques affect SU(3) gauge configurations, focusing on large Wilson loops and topological charge, to improve lattice QCD simulations.
Contribution
It compares six gauge actions and three smearing methods, analyzing their effects on Wilson loops and topological charge, providing insights into optimizing lattice gauge theory computations.
Findings
Smearing improves signal-to-noise ratio for Wilson loops.
Fat-link topological charge is most effective on improved actions.
Results confirm Lepage's prediction on noise reduction.
Abstract
The effect of repeatedly smearing SU(3) gauge configurations is investigated. Six gauge actions (Wilson, Symanzik, Iwasaki, DBW2, Beinlich-Karsch-Laermann, Langfeld; combined with a direct SU(3)-overrelaxation step) and three smearings (APE, HYP, EXP) are compared. The impact on large Wilson loops is monitored, confirming the signal-to-noise prediction by Lepage. The fat-link definition of the ``naive'' topological charge proves most useful on improved action ensembles.
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