We study the exact N→∞ solution of the two-dimensional lattice o(N) σ-model, described by a two parameter action that mixes Wilson (quadratic) and RPN-1≈O(N)/Z2 (quartic) actions. A rich phase structure emerges, with a first order transition line crossing, in the two-dimensional parameter space the RPN-1 axis. At the end of this line the specific-heat diverges while the correlation length remains finite. © 1987 Springer-Verlag.
Magnoli N., Ravanini F. (1987). Phase transitions in lattice 2 D O(N)σ-model with mixed action in the large N limit. ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS, 34(1), 43-48 [10.1007/BF01561113].
Phase transitions in lattice 2 D O(N)σ-model with mixed action in the large N limit
Ravanini F.
1987
Abstract
We study the exact N→∞ solution of the two-dimensional lattice o(N) σ-model, described by a two parameter action that mixes Wilson (quadratic) and RPN-1≈O(N)/Z2 (quartic) actions. A rich phase structure emerges, with a first order transition line crossing, in the two-dimensional parameter space the RPN-1 axis. At the end of this line the specific-heat diverges while the correlation length remains finite. © 1987 Springer-Verlag.File in questo prodotto:
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