Competitive induced resonance

T. VAZ MARTINS; A.P. MAJTEY; R. TORAL

Conferencia; European Conference on Complex Systems; 2009

We study a bistable Phi4 model composed by units coupled through both attractive and repulsive links. This system is subjected to a subthreshold signal, and we observe that the response is enhanced for a given fraction of repulsive links. Competitive interactions are taken as a source of disorder, as an alternative to previous studies where response was amplified by disorder induced by noise [1] or diversity [2]. Resorting to numerical simulations and analytical calculations we propose a macroscopic mechanism of resonance, considering the effect of disorder on the stationary state distribution, in the absence of signal. Our choice of bistable units is related to the role bistability plays in Stochastic [1] or Diversity induced resonance [2] studies. We want to show that the maintenance of bistability is not required, and in fact the optimal disorder is the one that destroys the system bistability [3].