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New numerical results and novel effective string predictions for Wilson loops

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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 use a Montecarlo evaluation, in the 3 d 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.

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Authors and Affiliations

  1. Dipartimento di Fisica Teorica, Università di Torino, and Istituto Nazionale di Fisica Nucleare - sezione di Torino, Via P. Giuria 1, I-10125, Torino, Italy

    M. Billó, M. Caselle & R. Pellegrini

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  1. M. Billó
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  2. M. Caselle
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  3. R. Pellegrini
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Correspondence to M. Billó.

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ArXiv ePrint: 1105.1869

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Billó, M., Caselle, M. & Pellegrini, R. New numerical results and novel effective string predictions for Wilson loops. J. High Energ. Phys. 2012, 104 (2012). https://doi.org/10.1007/JHEP01(2012)104

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  • DOI: https://doi.org/10.1007/JHEP01(2012)104

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