Propagation of travelling waves in sub-excitable systems driven by noise and periodic forcing

F. N. Si, Q. X. Liu (), J. Z. Zhang and L. Q. Zhou

The European Physical Journal B: Condensed Matter and Complex Systems, 2007, vol. 60, issue 4, 507-513

Abstract: It has been reported that traveling waves propagate periodically and stably in sub-excitable systems driven by noise [Phys. Rev. Lett. 88, 138301 (2002)]. As a further investigation, here we observe different types of traveling waves under different noises and periodic forces, using a simplified Oregonator model. Depending on different noises and periodic forces, we have observed different types of wave propagation (or their disappearance). Moreover, reversal phenomena are observed in this system based on the numerical experiments in the one-dimensional space. We explain this as an effect of periodic forces. Thus, we give qualitative explanations for how stable reversal phenomena appear, which seem to arise from the mixing function of the periodic force and the noise. The output period and three velocities (normal, positive and negative) of the travelling waves are defined and their relationship with the periodic forces, along with the types of waves, are also studied in sub-excitable system under a fixed noise intensity. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Keywords: 82.40.Ck Pattern formation in reactions with diffusion, flow and heat transfer, 05.40.Ca Noise, 47.54.-r Pattern selection; pattern formation, 83.60.Np Effects of electric and magnetic fields, (search for similar items in EconPapers)
Date: 2007
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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DOI: 10.1140/epjb/e2008-00009-1

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