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Previous works have shown numerically that the response of a " stochastic res-onator " is enhanced as a consequence of spatial coupling. Also, similar results have been obtained in a reaction-diffusion model by studying the phenomenon of stochastic resonance (SR) in spatially extended systems using nonequilib-rium potential (NEP) techniques. The knowledge… (More)

- M S De La Lama, I G Szendro, J R Iglesias, H S Wio
- 2006

We analyze a simple opinion formation model consisting of two parties, A and B, and a group I, of undecided agents. We assume that the supporters of parties A and B do not interact among them, but only interact through the group I, and that there is a nonzero probability of a spontaneous change of opinion (A I, B I). From the master equation, and via van… (More)

- C J Tessone, R Toral, P Amengual, H S Wio, M San Miguel
- 2004

We study the effect of finite size population in Galam's model [Eur. Phys. J. B 25, 403 (2002)] of minority opinion spreading and introduce neighborhood models that account for local spatial effects. For systems of different sizes N , the time to reach consensus is shown to scale as ln N in the original version, while the evolution is much slower in the new… (More)

- M A Fuentes, Ul Toral, Horacio S Wio
- 2001

We have analyzed the phenomenon of stochastic resonance in a double well potential driven by a colored non Gaussian noise. Using a path-integral approach we have obtained a consistent Markovian approximation that enables us to get, through the two state theory, analytical expressions for the signal-to-noise ratio, nding an enhancement of this quantity when… (More)

- Marta S De La Lama, Juan M López, Horacio S Wio
- 2005

– We introduce stochastic driving in the Sznajd model of opinion spreading. This stochastic effect is meant to mimic a social temperature, so that agents can take random decisions with a varying probability. We show that a stochastic driving has a tremendous impact on the system dynamics as a whole by inducing an order-disorder nonequilibrium phase… (More)

Here we present a study of stochastic resonance in an extended FitzHugh-Nagumo system with a field dependent activator diffusion. We show that the system response (here measured through the output signal-to-noise ratio) is enhanced due to the particular form of the non-homogeneous coupling. Such a result supports previous ones obtained in a simpler scalar… (More)

A recently introduced lattice model, describing an extended system which exhibits a reentrant ͑symmetry-breaking, second-order͒ noise-induced nonequilibrium phase transition, is studied under the assumption that the multiplicative noise leading to the transition is colored. Within an effective Markovian approximation and a mean-field scheme it is found that… (More)

- Gleb Oshanin, Katja Lindenberg, Horacio S Wio, Sergei Burlatsky Laboratory J.-V. Poncelet, Independent University of Moscow, Russia +13 others
- 2009

We study the kinetics for the search of an immobile target by randomly moving searchers that detect it only upon encounter. The searchers perform intermittent random walks on a one-dimensional lattice. Each searcher can step on a nearest neighbor site with probability α, or go off lattice with probability 1 − α to move in a random direction until it lands… (More)

Recent massive numerical simulations have shown that the response of a " stochastic resonator " is enhanced as a consequence of spatial coupling. Similar results have been analytically obtained in a reaction-diffusion model, using nonequilibrium potential techniques. We now consider a field-dependent diffu-sivity and show that the selectivity of the… (More)

We study an extended system that without noise shows a monostable dynamics, but when submitted to an adequate multiplicative noise, an effective bistable dynamics arises. The stochastic resonance between the attractors of the noise-sustained dynamics is investigated theoretically in terms of a two-state approximation. The knowledge of the exact… (More)