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Ergodicity and mixing properties of the northeast model

Published online by Cambridge University Press:  14 July 2016

George Kordzakhia
Affiliation:
University of California, Berkeley
Steven P. Lalley*
Affiliation:
University of Chicago
*
∗∗Postal address: Department of Statistics, University of Chicago, 5734 University Avenue, Chicago, IL 60637, USA. Email address: [email protected]
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Abstract

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The northeast model is a spin system on the two-dimensional integer lattice that evolves according to the following rule: whenever a site's southerly and westerly nearest neighbors have spin 1, it may reset its own spin by tossing a p-coin; at all other times, its spin remains frozen. It is proved that the northeast model has a phase transition at pc = 1 - βc, where βc is the critical parameter for oriented percolation. For p < pc, the trivial measure, δ0, that puts mass one on the configuration with all spins set at 0 is the unique ergodic, translation-invariant, stationary measure. For ppc, the product Bernoulli-p measure on configuration space is the unique nontrivial, ergodic, translation-invariant, stationary measure for the system, and it is mixing. For p > ⅔, it is shown that there is exponential decay of correlations.

Type
Research Article
Copyright
© Applied Probability Trust 2006 

Footnotes

Current address: Food and Drug Administration, Center for Drug Evaluation and Research, Division of Biometrics 1, Building 22, Room 4235, 10903 New Hampshire Avenue, Silver Spring, MD 20993-0002, USA. Email address: [email protected]

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