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Complex-q zeros of the partition function of the Potts model with long-range interactions

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  • Glumac, Zvonko
  • Uzelac, Katarina

Abstract

The zeros of the partition function of the ferromagnetic q-state Potts model with long-range interactions in the complex-q plane are studied in the mean-field case, while preliminary numerical results are reported for the finite 1d chains with power-law decaying interactions. In both cases, at any fixed temperature, the zeros lie on the arc-shaped contours, which cross the positive real axis at the value for which the given temperature is transition temperature. For finite number of spins the positive real axis is free of zeros, which approach to it in the thermodynamic limit. The convergence exponent of the zero closest to the positive real-q axis is found to have the same value as the temperature critical exponent 1/ν.

Suggested Citation

  • Glumac, Zvonko & Uzelac, Katarina, 2002. "Complex-q zeros of the partition function of the Potts model with long-range interactions," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 310(1), pages 91-108.
  • Handle: RePEc:eee:phsmap:v:310:y:2002:i:1:p:91-108
    DOI: 10.1016/S0378-4371(02)00742-2
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