Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1999-11-24
Nucl.Phys. B583 (2000) 597-613
Physics
High Energy Physics
High Energy Physics - Theory
22 pages, latex
Scientific paper
10.1016/S0550-3213(00)00324-2
The study of the scaling limit of two-dimensional models of statistical mechanics within the framework of integrable field theory is illustrated through the example of the RSOS models. Starting from the exact description of regime III in terms of colliding particles, we compute the correlation functions of the thermal, $\phi_{1,2}$ and (for some cases) spin operators in the two-particle approximation. The accuracy obtained for the moments of these correlators is analysed by computing the central charge and the scaling dimensions and comparing with the exact results. We further consider the (generally non-integrable) perturbation of the critical points with both the operators $\phi_{1,3}$ and $\phi_{1,2}$ and locate the branches solved on the lattice within the associated two-dimensional phase diagram. Finally we discuss the fact that the RSOS models, the dilute $q$-state Potts model at and the O(n) vector model are all described by the same perturbed conformal field theory.
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