Potts model: Duality, Uniformization and the Seiberg-Witten modulus

Abstract

The introduction of a modulus z(K), analogous to u=<tr phi^2> in the N=2 SUSY SU(2) gauge theory solved by Seiberg and Witten, and whose defining property is the invariance under the symmetry and duality transformations of the effective coupling K, reveals an intriguing correspondence between the D=2 Ising and Potts models on the square lattice. The moduli spaces of both models, the spaces of inequivalent effective temperatures K, correspond to a three-punctured sphere M_3=P^1(C)\{z=+1,-1,\infty}. Furthermore, in both models, the locus of Fisher zeroes is given by the segment joining z_c=-1 to z_c=+1.