Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2001-09-25
Physics
Condensed Matter
Statistical Mechanics
RevTex, 22 pgs, 6 figures. Invited Talk STATPHYS21, Proceedings to be published in Physica A
Scientific paper
10.1016/S0378-4371(02)00493-4
Previous works have shown numerically that the response of a ``stochastic resonator'' 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 "nonequilibrium potential" (NEP) techniques. The knowledge of the NEP for such systems allows us to determine the probability for the decay of the metastable extended states, and approximate expressions for the correlation function and the signal-to-noise ratio (SNR). Here, exploiting known forms of the NEP, we have investigated the role of NEP's symmetry on SR, the enhancement of the SNR due to a "selectivity" of the coupling or diffusion parameter, and discussed competition between local and nonlocal (excitatory) coupling.
Bouzat Sebastian
Haeften von B.
Wio Horacio S.
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