The low-temperature phase of Kac-Ising models

Details The low-temperature phase of Kac-Ising models The low-temperature phase of Kac-Ising models

1996-05-06

arxiv.org/abs/cond-mat/9605032v1

Physics

Condensed Matter

19pp, Plain TeX

Scientific paper

10.1007/BF02181490

We analyse the low temperature phase of ferromagnetic Kac-Ising models in dimensions $d\geq 2$. We show that if the range of interactions is $\g^{-1}$, then two disjoint translation invariant Gibbs states exist, if the inverse temperature $\b$ satisfies $\b -1\geq \g^\k$ where $\k=\frac {d(1-\e)}{(2d+1)(d+1)}$, for any $\e>0$. The prove involves the blocking procedure usual for Kac models and also a contour representation for the resulting long-range (almost) continuous spin system which is suitable for the use of a variant of the Peierls argument.

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