Issue
EPL
Volume 77, Number 6, March 2007
Article Number 60005
Number of page(s) 6
Section General
DOI http://dx.doi.org/10.1209/0295-5075/77/60005
Published online 05 March 2007
EPL, 77 (2007) 60005
DOI: 10.1209/0295-5075/77/60005

Effective surface-tension in the noise-reduced voter model

Luca Dall'Asta1, 2 and Claudio Castellano3

1  Laboratoire de Physique Théorique (UMR du CNRS 8627) - Bâtiment 210, Université de Paris-Sud, 91405 Orsay Cedex, France
2  Abdus Salam International center for Theoretical Physics - Strada Costiera 11, 34014, Trieste, Italy
3  Dipartimento di Fisica, Università "La Sapienza" and SMC-INFM - P.le A. Moro 2, 00185 Roma, Italy


received 7 December 2006; accepted in final form 2 February 2007; published March 2007
published online 5 March 2007

Abstract
The role of memory is crucial in determining the properties of many dynamical processes in statistical physics. We show that the simple addition of memory, in the form of noise reduction, modifies the overall scaling behavior of the voter model, introducing an effective surface tension analogous to that recently observed in memory-based models of social dynamics. The numerical results for low-dimensional lattices show a scaling behavior in good agreement with usual Cahn-Allen curvature-driven coarsening, even though slower preasymptotic regimes may be observed depending on the memory properties. Simple arguments and a mean-field analysis provide an explanation for the observed behavior that clarifies the origin of surface tension and the mechanism underlying the coarsening process.

PACS
05.40.-a - Fluctuation phenomena, random processes, noise, and Brownian motion.
02.50.-r - Probability theory, stochastic processes, and statistics.
89.65.-s - Social and economic systems.

© Europhysics Letters Association 2007