Spontaneous magnetisation in the plane

Details Spontaneous magnetisation in the plane Spontaneous magnetisation in the plane

2000-07-19

arxiv.org/abs/cond-mat/0007303v1

Physics

Condensed Matter

Statistical Mechanics

23 pages numbered -1,0...21, 8 figures

Scientific paper

The Arak process is a solvable stochastic process which generates coloured patterns in the plane. Patterns are made up of a variable number of random non-intersecting polygons. We show that the distribution of Arak process states is the Gibbs distribution of its states in thermodynamic equilibrium in the grand canonical ensemble. The sequence of Gibbs distributions form a new model parameterised by temperature. We prove that there is a phase transition in this model, for some non-zero temperature. We illustrate this conclusion with simulation results. We measure the critical exponents of this off-lattice model and find they are consistent with those of the Ising model in two dimensions.

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