ZEROS OF THE POTTS MODEL PARTITION FUNCTION IN THE LARGE-q LIMIT

Abstract

We calculate zeros of the q-state Potts model partition function Z(GΛ,q,v) for large q, where v is the temperature variable and GΛ is a section of a lattice Λ with coordination number κΛ and various boundary conditions. Lattice types studied include square, triangular, honeycomb, and kagomé. We show that for large q these zeros take on approximately circular patterns in the complex xΛ plane, where xΛ=v/q2/κΛ. This generalizes a known result for the square lattice to the other lattices considered.