A reaction-diffusion equation with memory

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November 2006, 15(4): 1079-1088. doi: 10.3934/dcds.2006.15.1079

A reaction-diffusion equation with memory

1.	Dipartimento di Matematica "F. Brioschi", Politecnico di Milano, I-20133 Milano

Received September 2004 Revised February 2005 Published May 2006

Abstract
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We consider a one-dimensional reaction-diffusion type equation with memory, originally proposed by W.E. Olmstead et al. to model the velocity $u$ of certain viscoelastic fluids. More precisely, the usual diffusion term $u_{x x}$ is replaced by a convolution integral of the form $\int_0^\infty k(s) u_{x x}(t-s)ds$, whereas the reaction term is the derivative of a double-well potential. We first reformulate the equation, endowed with homogeneous Dirichlet boundary conditions, by introducing the integrated past history of $u$. Then we replace $k$ with a time-rescaled kernel $k_\varepsilon$, where $\varepsilon>0$ is the relaxation time. The obtained initial and boundary value problem generates a strongly continuous semigroup $S_\varepsilon(t)$ on a suitable phase-space. The main result of this work is the existence of the global attractor for $S_\varepsilon(t)$, provided that $\varepsilon$ is small enough.

Keywords: Reaction-diffusion equations, global attractors., memory effects.

Mathematics Subject Classification: Primary: 35B41; Secondary: 45K05, 76A1.

Citation: M. Grasselli, V. Pata. A reaction-diffusion equation with memory. Discrete & Continuous Dynamical Systems - A, 2006, 15 (4) : 1079-1088. doi: 10.3934/dcds.2006.15.1079

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