Gauge-independent “Abelian” and magnetic-monopole dominance, and the dual Meissner effect in lattice SU(2) Yang-Mills theory
Seikou Kato, Kei-Ichi Kondo, Akihiro Shibata
DOI 10.1103/PhysRevD.91.034506 · Physical Review D
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Abstract
In the SU(2) Yang–Mills theory on the four-dimensional Euclidean lattice, we confirm the gauge-independent “Abelian” dominance (or the restricted field dominance) and gauge-independent magnetic-monopole dominance in the string tension of the linear potential extracted from the Wilson loop in the fundamental representation. The dual Meissner effect is observed by demonstrating the squeezing of the chromoelectric field flux connecting a pair of a quark and an antiquark. In addition, the circular magnetic-monopole current is induced around the chromoelectric flux. The type of the dual superconductivity is also determined by fitting the result with the dual Ginzburg–Landau model. Thus, the dual superconductor picture for quark confinement is supported in a gauge-independent manner. These results are obtained based on a reformulation of the lattice Yang–Mills theory based on the change of variables à la Cho–Duan-Ge–Faddeev–Niemi combined with a non-Abelian Stokes theorem for the Wilson loop operator. We give a new procedure (called the reduction) for obtaining the color direction field that plays the central role in this reformulation.
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