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Infrared Behaviour of Massless Integrable Flows entering the Minimal Models from phi31

G. Feverati, E. Quattrini, F. Ravanini

hep-tharXiv:hep-th/9512104

Abstract

It is known that any minimal model Mp receives along its phi31 irrelevant direction *two* massless integrable flows: one from Mp+1 perturbed by phi13, the other from Zp-1 parafermionic model perturbed by its generating parafermion field. By comparing Thermodynamic Bethe Ansatz data and ``predictions'' of infrared Conformal Perturbation Theory we show that these two flows are received by Mp with opposite coupling constants of the phi31 irrelevant perturbation. Some comments on the massless S matrices of these two flows are added.

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