Collective effects induced by diversity in extended systems
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We show that diversity, in the form of quenched noise, can have a constructive effect in the dynamics of extended systems. We first consider a bistable φ4 model composed by many coupled units and show that the global response to an external periodic forcing is enhanced under the presence of the right amount of diversity (measured as the dispersion in one of the parameters defining the model). As a second example, we consider a system of active-rotators and show that while they are at rest in the homogeneous case, the disorder introduced by the diversity suffices to trigger the appearance of common firings or pulses. Both effects require very simple ingredients and we expect the results presented here to be of interest in similar models.
KeywordsEuropean Physical Journal Special Topic Noise Intensity Stochastic Resonance Global Response Oscillatory Regime
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- H.S. Wio, Phys. Rev. E 54, R3075 (1996) Google Scholar
- J. García-Ojalvo, J.M. Sancho, Noise in Spatially Extended Systems (Springer, 1999) Google Scholar
- S.K. Ma, Modern theory of critical phenomena, Benjamin-Cummings, Reading (1976) Google Scholar
- Y. Kuramoto, in International Symposium on Mathematical Problems in Theoretical Physics 39, (1975) Google Scholar
- Y. Kuramoto, in Chemical Oscillations, Waves, and Turbulence (Springer-Verlag, New York, 1984) Google Scholar
- C.J. Tessone, C. Mirasso, R. Toral, J. Gunton, preprint: http://www.arxiv.org/cond-mat/0605082 Google Scholar
- C.J. Tessone, A. Scirè, R. Toral, P. Colet, preprint: http://www.arxiv.org/cond-mat/0505465 Google Scholar
- D.P. Landau, K. Binder, in A guide to Monte Carlo Simulations in Statistical Physics (Cambridge University Press, 2000) Google Scholar