Communications in Mathematical Physics

, Volume 331, Issue 3, pp 1071–1086 | Cite as

Phase Transition Free Regions in the Ising Model via the Kac–Ward Operator

  • Marcin LisEmail author


We provide an upper bound on the spectral radius of the Kac–Ward transition matrix for a general planar graph. Combined with the Kac–Ward formula for the partition function of the planar Ising model, this allows us to identify regions in the complex plane where the free energy density limits are analytic functions of the inverse temperature. The bound turns out to be optimal in the case of isoradial graphs, i.e., it yields criticality of the self-dual Z-invariant coupling constants.


Partition Function Transition Matrix Ising Model Spectral Radius Free Energy Density 
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© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Department of MathematicsVU UniversityAmsterdamThe Netherlands

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