Coherent Topological Charge Structure in $CP^{N-1}$ Models and QCD

Details Coherent Topological Charge Structure in $CP^{N-1}$ Models and QCD Coherent Topological Charge Structure in $CP^{N-1}$ Models and QCD

2005-09-21

arxiv.org/abs/hep-lat/0509066v1

Phys.Rev. D72 (2005) 114511

Physics

High Energy Physics

High Energy Physics - Lattice

26 pages

Scientific paper

10.1103/PhysRevD.72.114511

In an effort to clarify the significance of the recent observation of long-range topological charge coherence in QCD gauge configurations, we study the local topological charge distributions in two-dimensional $CP^{N-1}$ sigma models, using the overlap Dirac operator to construct the lattice topological charge. We find long-range sign coherence of topological charge along extended one-dimensional structures in two-dimensional spacetime. We discuss the connection between the long range topological structure found in $CP^{N-1}$ and the observed sign coherence along three-dimensional sheets in four-dimensional QCD gauge configurations. In both cases, coherent regions of topological charge form along membrane-like surfaces of codimension one. We show that the Monte Carlo results, for both two-dimensional and four-dimensional gauge theory, support a view of topological charge fluctuations suggested by Luscher and Witten. In this framework, the observed membranes are associated with boundaries between ``k-vacua,'' characterized by an effective local value of $\theta$ which jumps by $\pm 2\pi$ across the boundary.

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