title: Duality relations for M coupled potts models
abstract: We establish explicit duality transformations for systems of M q-state Potts models coupled through their local energy density, generalizing known results for M=1,2,3. The M-dimensional space of coupling constants contains a self-dual submanifold of dimension D(M)=[M/2]. For the case M=4, the variation of the effective central charge along the self-dual surface is investigated by numerical transfer matrix techniques. Evidence is given for the existence of a family of critical points, corresponding to conformal field theories with an extended S(M) symmetry algebra.
authors.affiliation: LPTMS, Bainsertion marktiment 100, Universite Paris-Sud, F-91405 Orsay, France.
authors.initials: JL
authors.lastname: Jacobsen