Abstract
Starting from correlation identities for the Ashkin-Teller model and using correlation inequalities, we obtain rigorous upper bounds on the critical temperatures. The results were obtained in hexagonal, square, and cubic lattices and improve over effective field type calculations. The rigorous upper bounds results are compared to those obtained by other methods.
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Acknowledgments
JPS financial support from FAPEMIG/Brazil (No. 11.607- FAPEMIG/Brazil). FCSB is grateful to CAPES/Brazil (Project 00035115 (PVNS)-Capes/Brazil) for the financial support that made possible his visit to the UFSJ/Brazil.
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Santos, J.P., Barreto, F.C.S. Upper Bounds on the Critical Temperature of the Ashkin-Teller Model. Braz J Phys 46, 70–77 (2016). https://doi.org/10.1007/s13538-015-0385-0
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DOI: https://doi.org/10.1007/s13538-015-0385-0