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arXiv 0801.0262hep-lat
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SU中的Z2电弦和中心涡旋(2)格点规范理论

Z2 electric strings and center vortices in SU(2) lattice gauge theory

M. I. Polikarpov, P. V. Buividovich

摘要:

我们研究了SU(2)格点规范理论在中心涡和Z2电弦(即在威尔逊圈上开口的表面)世界面上的求和。结果表明,与中心涡旋相反,Z2电弦的密度在理论的连续极限内发散,而与规范固定无关,然而,由于它们在路径积分中的统计权重的非正性,它们对威尔逊圈的贡献产生了物理弦张力,这又与理论中Z2拓扑单极的存在有关.

英文摘要:

We study the representations of SU(2) lattice gauge theory in terms of sums over the worldsheets of center vortices and Z2 electric strings, i.e. surfaces which open on the Wilson loop. It is shown that in contrast to center vortices the density of electric Z2 strings diverges in the continuum limit of the theory independently of the gauge fixing, however, their contribution to the Wilson loop yields physical string tension due to non-positivity of their statistical weight in the path integral, which is in turn related to the presence of Z2 topological monopoles in the theory.

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