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Non-stabilizing solutions of semilinear hyperbolic and elliptic equations with damping

Published online by Cambridge University Press:  12 July 2007

M. A. Jendoubi
Affiliation:
Laboratoire de Mathématiques Appliquées, Bat. Fermat, 45 avenue des Etats-Unis, 78035 Versailles cedex, France
P. Poláčik
Affiliation:
School of Mathematics, University of Minnesota, Minneapolis, MN 55455, USA

Abstract

We consider two types of equations on a cylindrical domain Ω × (0, ∞), where Ω is a bounded domain in RN, N ≥ 2. The first type is a semilinear damped wave equation, in which the unbounded direction of Ω × (0, ∞) is reserved for time t. The second type is an elliptic equation with a singled-out unbounded variable t. In both cases, we consider solutions that are defined and bounded on Ω × (0, ∞) and satisfy a Dirichlet boundary condition on ∂Ω × (0, ∞). We show that, for some nonlinearities, the equations have bounded solutions that do not stabilize to any single function φ: Ω → R, as t → ∞; rather, they approach a continuum of such functions. This happens despite the presence of damping in the equation that forces the t derivative of bounded solutions to converge to 0 as t → ∞. Our results contrast with known stabilization properties of solutions of such equations in the case N = 1.

Type
Research Article
Copyright
Copyright © Royal Society of Edinburgh 2003

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