Vacuum structure revealed by over-improved stout-link smearing compared with the overlap analysis for quenched QCD

Abstract

A detailed comparison is made between the topological structure of quenched QCD as revealed by the recently proposed over-improved stout-link smearing in conjunction with an improved gluonic definition of the topological density on one hand and a similar analysis made possible by the overlap-fermionic topological charge density both with and without variable ultraviolet cutoff ${\lambda }_{cut}$. The matching is twofold, provided by fitting the density-density two-point functions on one hand and by a point-by-point fitting of the topological densities according to the two methods. We point out the similar cluster structure of the topological density for moderate smearing and $200\mathrm{MeV}<{\lambda }_{cut}<600\mathrm{MeV}$, respectively. We demonstrate the relation of the gluonic topological density for extensive smearing to the location of the overlap zero modes and the lowest overlap non-zero mode as found for the unsmeared configurations.

19 pages, 18 figures

References in corpus (2)

• Exploring the structure of the quenched QCD vacuum with overlap fermions
• Quantitative comparison of filtering methods in lattice QCD

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