Clusters and Recurrence in the Two-Dimensional Zero-Temperature Stochastic Ising Model

Details Clusters and Recurrence in the Two-Dimensional Zero-Temperature Stochastic Ising Model Clusters and Recurrence in the Two-Dimensional Zero-Temperature Stochastic Ising Model

2001-03-07

arxiv.org/abs/math/0103050v1

Mathematics

Probability

16 pages, 1 figure

Scientific paper

We analyze clustering and (local) recurrence of a standard Markov process model of spatial domain coarsening. The continuous time process, whose state space consists of assignments of +1 or -1 to each site in ${\bf Z}^2$, is the zero-temperature limit of the stochastic homogeneous Ising ferromagnet (with Glauber dynamics): the initial state is chosen uniformly at random and then each site, at rate one, polls its 4 neighbors and makes sure it agrees with the majority, or tosses a fair coin in case of a tie. Among the main results (almost sure, with respect to both the process and initial state) are: clusters (maximal domains of constant sign) are finite for times $t< \infty$, but the cluster of a fixed site diverges (in diameter) as $t \to \infty$; each of the two constant states is (positive) recurrent. We also present other results and conjectures concerning positive and null recurrence and the role of absorbing states.

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