Geometry of contours and Peierls estimates in d=1 Ising models
arXiv:math-ph/0211062 · doi:10.1063/1.1897644
Abstract
Following Fröhlich and Spencer, we study one dimensional Ising spin systems with ferromagnetic, long range interactions which decay as $|x-y|^{-2+α}$, $0\leq α\leq 1/2$. We introduce a geometric description of the spin configurations in terms of triangles which play the role of contours and for which we establish Peierls bounds. This in particular yields a direct proof of the well known result by Dyson about phase transitions at low temperatures.
28 pages, 3 figures