, Volume 73, Issue 1, pp 83-94

Translation invariance and instability of phase coexistence in the two dimensional Ising system

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It is shown that any Gibbs state of the two dimensional ferromagnetic Ising system is of the form λμ++(1−λ)μ, with some λ∈ [0, 1]. This excludes the possibility of a locally stable phase coexistence and of translation symmetry breaking, which are known to occur in higher dimensions. Use is made in the proof of the stochastic aspects of the geometry of the interface lines.

Supported in part by the U.S. National Science Foundation under the grant PHY — 7825390
Communicated by A. Jaffe