English

Typical Gibbs configurations for the 1d Random Field Ising Model with long range interaction

Probability 2015-05-20 v1

Abstract

We study a one--dimensional Ising spin systems with ferromagnetic, long--range interaction decaying as n2+\an^{-2+\a}, \a[0,12]\a \in [0,\frac 12], in the presence of external random fields. We assume that the random fields are given by a collection of symmetric, independent, identically distributed real random variables, gaussian or subgaussian with variance θ\theta. We show that for temperature and variance of the randomness small enough, with an overwhelming probability with respect to the random fields, the typical configurations, within volumes centered at the origin whose size grow faster than any power of th1\th^{-1}, % {\bf around the origin} are intervals of ++ spins followed by intervals of - spins whose typical length is th2(12\a) \simeq \th^{-\frac{2}{(1-2\a)}} for 0\a<1/20\le \a<1/2 and e1th2\simeq e^{\frac 1 {\th^{2}}} for \a=1/2\a=1/2.

Keywords

Cite

@article{arxiv.1011.6487,
  title  = {Typical Gibbs configurations for the 1d Random Field Ising Model with long range interaction},
  author = {Marzio Cassandro and Enza Orlandi and Pierre Picco},
  journal= {arXiv preprint arXiv:1011.6487},
  year   = {2015}
}
R2 v1 2026-06-21T16:50:54.008Z