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Spatial and dynamical chaos generated by reaction-diffusion systems in unbounded domains

Zelik, SV (2007) Spatial and dynamical chaos generated by reaction-diffusion systems in unbounded domains JOURNAL OF DYNAMICS AND DIFFERENTIAL EQUATIONS, 19 (1). 1 - 74. ISSN 1040-7294

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Abstract

We consider in this article a nonlinear reaction-diffusion system with a transport term (L, del(x))u, where L is a given vector field, in an unbounded domain Omega. We prove that, under natural assumptions, this system possesses a locally compact attractor A in the corresponding phase space. Since the dimension of this attractor is usually infinite, we study its Kolmogorov's epsilon-entropy and obtain upper and lower bounds of this entropy Moreover, we give a more detailed study of the spatio-temporal chaos generated by the spatially homogeneous RDS in Omega = R-n In order to describe this chaos, we introduce an extended (n + 1)-parametrical semigroup, generated on the attractor by 1-parametrical temporal dynamics and by n-parametrical group of spatial shifts (=spatial dynamics). We prove that this extended semigroup, has finite topological entropy, in contrast to the case of purely temporal or purely spatial dynamics, where the topological entropy is infinite. We also modify the concept of topological entropy in such a way that the modified one is finite and strictly positive, in particular for purely temporal and for purely spatial dynamics on the attractor. In order to clarify the nature of the spatial and temporal chaos on the attractor, we use (following Zelik, 2003, Comm. Pure. Appl. Math. 56(5), 584-637) another model dynamical system, which is an adaptation of Bernoulli shifts to the case of infinite entropy and construct homeomorphic embeddings of it into the spatial and temporal dynamics on A As a corollary of the obtained embeddings, we finally prove that every finite dimensional dynamics can be realized (up to a homeomorphism) by restricting the temporal dynamics to the appropriate invariant subset of A.

Item Type: Article
Uncontrolled Keywords: Science & Technology, Physical Sciences, Mathematics, Applied, Mathematics, reaction-diffusion systems, unbounded domains, entropy, spatial and dynamical chaos, GINZBURG-LANDAU EQUATION, EVOLUTION-EQUATIONS, GLOBAL ATTRACTOR, EXISTENCE, BOUNDS, ENTROPY, SPACE
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Divisions: Faculty of Engineering and Physical Sciences > Mathematics
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:41
Last Modified: 23 Sep 2013 18:33
URI: http://epubs.surrey.ac.uk/id/eprint/1481

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