Coupled cluster analysis of the U(1) lattice gauge model using a correlated "mean-field" reference state

S. J. Baker, R. F. Bishop, N. J. Davidson

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    Abstract

    We apply the coupled cluster method (CCM) to the U(1) lattice gauge model in 2+1 dimensions, basing our analysis on a reference state which already contains a certain class of single-plaquette correlations, the socalled "mean-field" reference state. We consider the simplest possible approximation scheme for the coupled cluster calculation, in which only single-plaquette correlations are included. The use of the "mean-field" reference state allows us to reproduce, within this level of approximation, the correct leading-order behavior of the ground-state energy of the equivalent Mathieu problem in both the strong- and weak-coupling limits. In addition, we have calculated the mean plaquette and the odd- and even-parity mass gaps.
    Original languageEnglish
    Pages (from-to)2610-2618
    Number of pages9
    JournalPhysical Review D (Particles, Fields, Gravitation and Cosmology)
    Volume53
    DOIs
    Publication statusPublished - 1996

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