Abstract
I give a proof of the Kosterlitz-Thouless transition for sufficiently anisotropic (J zJ −1x =J zJ −1y <2q −(JKT)−J) two-dimensionalN-component rotators (N⩾ 3). The method is based on Wells' inequality and is related to mean field Gaussian inequalities.
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Dunlop, F. Correlation inequalities and the Kosterlitz-Thouless transition for anisotropic rotators. J Stat Phys 41, 733–743 (1985). https://doi.org/10.1007/BF01010001
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DOI: https://doi.org/10.1007/BF01010001