Evidence Against Instanton Dominance of Topological Charge Fluctuations in QCD

Details Evidence Against Instanton Dominance of Topological Charge Fluctuations in QCD Evidence Against Instanton Dominance of Topological Charge Fluctuations in QCD

2001-02-07

arxiv.org/abs/hep-lat/0102003v1

Phys.Rev. D65 (2002) 014502

Physics

High Energy Physics

High Energy Physics - Lattice

35 pages, 11 figures

Scientific paper

10.1103/PhysRevD.65.014502

The low-lying eigenmodes of the Dirac operator associated with typical gauge field configurations in QCD encode, among other low-energy properties, the physics behind the solution to the $U_A(1)$ problem (i.e. the origin of the $\eta'$ mass), the nature of spontaneous chiral symmetry breaking, and the physics of string-breaking, quark-antiquark pair production, and the OZI rule. Moreover, the space-time chiral structure of these eigenmodes reflects the space-time topological structure of the underlying gauge field. We present evidence from lattice QCD on the local chiral structure of low Dirac eigenmodes leading to the conclusion that topological charge fluctuations of the QCD vacuum are not instanton-dominated. The result supports Witten's arguments that topological charge is produced by confinement-related gauge fluctuations rather than instantons.

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