Issue
EPL
Volume 88, Number 4, November 2009
Article Number 40006
Number of page(s) 5
Section General
DOI http://dx.doi.org/10.1209/0295-5075/88/40006
Published online 27 November 2009
EPL, 88 (2009) 40006
DOI: 10.1209/0295-5075/88/40006

Statistical mechanics of finite arrays of coupled bistable elements

J. Gómez-Ordóñez1, J. M. Casado1, M. Morillo1, C. Honisch2 and R. Friedrich2

1   Física Teórica, Universidad de Sevilla - Apartado de Correos 1065, Sevilla 41080, Spain, EU
2   Institut für Theoretische Physik, Westfälische Wilhelms-Universität Münster - D-48149 Münster, Germany, EU

morillo@us.es

received 3 July 2009; accepted in final form 30 October 2009; published November 2009
published online 27 November 2009

Abstract
We discuss the equilibrium of a single collective variable characterizing a finite set of coupled, noisy, bistable systems as the noise strength, the size and the coupling parameter are varied. We identify distinct regions in parameter space. Our finite size results indicate important qualitative differences with respect to those obtained in the asymptotic infinite size limit. We also discuss how to construct approximate 1-dimensional Langevin equations. This equation provides a useful tool to understand the collective behavior even in the presence of an external driving force.

PACS
05.45.Xt - Synchronization; coupled oscillators.
05.10.Gg - Stochastic analysis methods (Fokker-Planck, Langevin, etc.).
05.40.Ca - Noise.

© EPLA 2009