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Collective effects induced by diversity in extended systems

  • R. Toral
  • C. J. Tessone
  • J. V. Lopes
Article

Abstract.

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.

Keywords

European Physical Journal Special Topic Noise Intensity Stochastic Resonance Global Response Oscillatory Regime 
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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Authors and Affiliations

  • R. Toral
    • 1
  • C. J. Tessone
    • 1
  • J. V. Lopes
    • 2
  1. 1.Instituto Mediterráneo de Estudios Avanzados (IMEDEA)Palma de MallorcaSpain
  2. 2.Centro de Física do Porto, Departamento de Física, Faculdade de CiênciasUniversidade do PortoPortoPortugal

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