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Dynamics and topological entropy of 1D Greenberg–Hastings cellular automata

Published online by Cambridge University Press:  09 March 2020

M. KESSEBÖHMER
Affiliation:
Department 3: Mathematics, University of Bremen, Bibliothekstr. 5, 28359Bremen, Germany email d.ulbrich@uni-bremen.de
J. D. M. RADEMACHER
Affiliation:
Department 3: Mathematics, University of Bremen, Bibliothekstr. 5, 28359Bremen, Germany email d.ulbrich@uni-bremen.de
D. ULBRICH
Affiliation:
Department 3: Mathematics, University of Bremen, Bibliothekstr. 5, 28359Bremen, Germany email d.ulbrich@uni-bremen.de
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Abstract

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In this paper we analyse the non-wandering set of one-dimensional Greenberg–Hastings cellular automaton models for excitable media with $e\geqslant 1$ excited and $r\geqslant 1$ refractory states and determine its (strictly positive) topological entropy. We show that it results from a Devaney chaotic closed invariant subset of the non-wandering set that consists of colliding and annihilating travelling waves, which is conjugate to a skew-product dynamical system of coupled shift dynamics. Moreover, we determine the remaining part of the non-wandering set explicitly as a Markov system with strictly less topological entropy that also scales differently for large $e,r$.

Type
Original Article
Creative Commons
Creative Common License - CCCreative Common License - BY
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Copyright
© The Author(s) 2020. Published by Cambridge University Press

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