Heterogeneity-induced effects for pulse dynamics in FitzHugh–Nagumo-type systems

Chao Nien Chen, Shin Ichiro Ei, Shyuh yaur Tzeng

研究成果: Article

3 引文 斯高帕斯(Scopus)

摘要

Particle like structures have been observed in many fields of science. In a homogeneous medium, a stable, standing pulse is a localized wave that may arise when nonlinear and dissipative effects are in balance. In this paper, we investigate certain phenomena associated with the dynamics of pulse solutions for a FitzHugh–Nagumo reaction–diffusion model. When two pulses are located far from one another initially, their weak interaction drives the subsequent slow dynamics. Our comprehension of the standing pulse profiles allows us to quantitatively characterize their interplay; when the diffusivity of the activator is small compared to that of the inhibitor, the two pulses repel. In addition, using a center-manifold reduction to study the presence of heterogeneities in the environment, we demonstrate that the pulses will move so as to maximize the strength of activation or minimize that of inhibition. The pulse motion will also be influenced by the reaction mechanism.

原文English
頁(從 - 到)22-32
頁數11
期刊Physica D: Nonlinear Phenomena
382-383
DOIs
出版狀態Published - 2018 十一月 1

All Science Journal Classification (ASJC) codes

  • Statistical and Nonlinear Physics
  • Mathematical Physics
  • Condensed Matter Physics
  • Applied Mathematics

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