New numerical results and novel effective string predictions for Wilson loops

Abstract

We compute the prediction of the Nambu-Goto effective string model for a rectangular Wilson loop up to three loops. This is done through the use of an operatorial, first order formulation and of the open string analogues of boundary states. This result is interesting since there are universality theorems stating that the predictions up to three loops are common to all effective string models. To test the effective string prediction, we set up the Montecarlo evaluation, in the 3d Ising gauge model, of an observable (the ratio of two Wilson loops with the same perimeter) for which boundary effects are relatively small. Our simulation attains a level of precision which is sufficient to test the two-loop correction. The three-loop correction seems to go in the right direction, but is actually yet beyond the reach of our simulation, since its effect is comparable with the statistical errors of the latter.

27 pages, LaTeX2e, 5 figures - Revised version which corrects a few misprints present in the published version, regarding Eq.s (4.30), (4.35), (A.4) and (A.6). Plots and results of the paper are not affected since they were derived from the correct formulae

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• Fine corrections in the effective string describing SU(2) Yang-Mills theory in three dimensions
• Rectangular Wilson Loops at Large N
• The unreasonable effectiveness of effective string theory: the case of the 3d SU(2) Higgs model
• On the $T\bar{T}$ deformation of the compactified boson and its interpretation in Lattice Gauge Theory
• Ising string beyond Nambu-Goto
• Simulating the All-Order Strong Coupling Expansion V: Ising Gauge Theory
• On the question of quark confinement in the Abelian U(1) QED gauge interaction
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• Large-size expansion for triangular Wilson loops in confining gauge theories
• Intermediate-Distance String Effects in Wilson Loops\\ via Boundary Action