Are Topological Charge Fluctuations in QCD Instanton Dominated?

Details Are Topological Charge Fluctuations in QCD Instanton Dominated? Are Topological Charge Fluctuations in QCD Instanton Dominated?

2001-05-04

arxiv.org/abs/hep-lat/0105004v2

Phys.Rev. D65 (2002) 014505

Physics

High Energy Physics

High Energy Physics - Lattice

LaTeX, 15 pages, 8 postscript figures, minor improvements, version to appear in PRD

Scientific paper

10.1103/PhysRevD.65.014505

We consider a recent proposal by Horv\'ath {\em et al.} to address the question whether topological charge fluctuations in QCD are instanton dominated via the response of fermions using lattice fermions with exact chiral symmetry, the overlap fermions. Considering several volumes and lattice spacings we find strong evidence for chirality of a finite density of low-lying eigenvectors of the overlap-Dirac operator in the regions where these modes are peaked. This result suggests instanton dominance of topological charge fluctuations in quenched QCD.

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