CONFORMAL POINTS AND DUALITY OF NON-ABELIAN THIRRING MODELS AND INTERACTING WZNW MODELS

We show that the strong coupling phase of the non-Abelian Thirring mod el is dual to the weak-coupling phase of a system of two WZNW models c oupled to each other through a current-current interaction. This latte r system is integrable and is related to a perturbed conformal field t heory which, in the large \k\ limit, has a non-trivial zero of the per turbation-parameter beta function. The non-Abelian Thirring model redu ces to a free fermion theory plus a topological field theory at this c ritical point, which should therefore be identified with the isoscalar Dashen-Frishman conformal point. The relationship with the Gross-Neve u model is discussed.