Free energy of the three-state $τ_2(t_q)$ model as a product of elliptic functions

Abstract

{We show that the free energy of the three-state $τ_2(t_q)$ model can be expressed as products of Jacobi elliptic functions, the arguments being those of an hyperelliptic parametrization of the associated chiral Potts model. This is the first application of such a parametrization to the $N$-state chiral Potts free energy problem for $N > 2$.