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Quantitative comparison of filtering methods in lattice QCD

Presenter: Stefan Solbrig — University of Regensburg

Falk Bruckmann, Christof Gattringer, Ernst-Michael Ilgenfritz, Michael Mueller-Preussker, Andreas Schaefer, Stefan Solbrig

We systematically compare filtering methods used to extract topological excitations from lattice gauge configurations, namely smearing, Laplace filtering and the fermionic topological charge (with chirally improved fermions). Each of these techniques introduces ambiguities, like its parameter dependence. We show, however, that all these methods can be tuned to each other over a broad range of filtering levels and that they reveal very similar topological structures. For these common structures we find an interesting power-law relating the number and packing fraction of clusters of filtered topological charge.