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Global structure in spatiotemporal chaos of the Matthews-Cox equations

Hidetsugu Sakaguchi1 and Dan Tanaka2,*

  • 1Department of Applied Science for Electronics and Materials, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
  • 2Department of Human and Artificial Intelligent Systems, Graduate School of Engineering, Fukui University, 3-9-1 Bunkyo, Fukui 910-8507, Japan

  • *dan@u-fukui.ac.jp

Phys. Rev. E 76, 025201(R) – Published 13 August, 2007

DOI: https://doi.org/10.1103/PhysRevE.76.025201

Abstract

We find that an amplitude death state and a spatiotemporally chaotic state coexist spontaneously in the Matthews-Cox equations and this coexistence is robust. Although the entire system is far from equilibrium, the domain wall between the two states is stabilized by a negative-feedback effect due to a conservation law. This is analogous to the phase separation in conserved systems that exhibit spinodal decompositions. We observe similar phenomena also in the Nikolaevskii equation, from which the Matthews-Cox equations were derived. A Galilean invariance of the former equation corresponds to the conservation law of the latter equations.

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