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Non compact continuum limit of two coupled Potts models

Abstract : We study two $Q$-state Potts models coupled by the product of their energy operators, in the regime $2 < Q \le 4$ where the coupling is relevant. A particular choice of weights on the square lattice is shown to be equivalent to the integrable $a_3^{(2)}$ vertex model. It corresponds to a selfdual system of two antiferromagnetic Potts models, coupled ferromagnetically. We derive the Bethe Ansatz equations and study them numerically for two arbitrary twist angles. The continuum limit is shown to involve two compact bosons and one non compact boson, with discrete states emerging from the continuum at appropriate twists. The non compact boson entails strong logarithmic corrections to the finite-size behaviour of the scaling levels, the understanding of which allows us to correct an earlier proposal for some of the critical exponents. In particular, we infer the full set of magnetic scaling dimensions (watermelon operators) of the Potts model.
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Contributor : Emmanuelle De Laborderie Connect in order to contact the contributor
Submitted on : Wednesday, September 17, 2014 - 4:25:49 PM
Last modification on : Monday, December 13, 2021 - 9:16:03 AM

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  • HAL Id : cea-01065025, version 1
  • ARXIV : 1406.1353


Eric Vernier, Jesper Lykke Jacobsen, Hubert Saleur. Non compact continuum limit of two coupled Potts models. 2014. ⟨cea-01065025⟩



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