An analyticity bound for two-dimensional Ising model at low temperature |
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| Authors: | Pierluigi Contucci |
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| Institution: | (1) International School for Advanced Studies, I-34014 Trieste, Italy;(2) Dipartimento di Fisica, Gruppo CAM, Universitá di Roma  La Sapienza, , I-00185 Rome, Italy |
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| Abstract: | We study the coexistence phase in the two-dimensional Ising model. Optimizing the cluster expansion technique, we are able to prove the phase separation phenomenon, with the Onsager value for the surface tension, in a range
, where
estimates from above the critical  within 19% and essentially coincides with the entropic bound. |
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| Keywords: | Cluster expansion polymer systems |
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