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Article Dans Une Revue Journal of Physics A: Mathematical and Theoretical Année : 1999

Phase ordering and persistence in a class of stochastic processes interpolating between the Ising and voter models

Une classe de modèles stochastiques interpolant entre les modèles d'Ising et celui de "l'électeur"

J.-M. Drouffe
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C. Godrèche
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Résumé

We study the dynamics of a class of two dimensional stochastic processes, depending on two parameters, which may be interpreted as two different temperatures, respectively associated to interfacial and to bulk noise. Special lines in the plane of parameters correspond to the Ising model, voter model and majority vote model. The dynamics of this class of models may be described formally in terms of reaction diffusion processes for a set of coalescing, annihilating, and branching random walkers. We use the freedom allowed by the space of parameters to measure, by numerical simulations, the persistence probability of a generic model in the low temperature phase, where the system coarsens. This probability is found to decay at large times as a power law with a seemingly constant exponent $\theta \approx 0.22$. We also discuss the connection between persistence and the nature of the interfaces between domains.

Dates et versions

hal-00087286 , version 1 (21-07-2006)

Identifiants

Citer

J.-M. Drouffe, C. Godrèche. Phase ordering and persistence in a class of stochastic processes interpolating between the Ising and voter models. Journal of Physics A: Mathematical and Theoretical, 1999, 32, pp.249-261. ⟨10.1088/0305-4470/32/2/003⟩. ⟨hal-00087286⟩
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