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Title: Canards and bifurcation delays of spatially homogeneous and inhomogeneous types in reaction-diffusion equations
Authors: DE MAESSCHALCK, Peter 
Popovic, Nikola
Kaper, Tasso J.
Issue Date: 2009
Source: Advances in Differential Equations, 14(9-10). p. 943-962
Abstract: In ordinary differential equations of singular perturbation type, the dynamics of solutions near saddle-node bifurcations of equilibria are rich. Canard solutions can arise, which, after spending time near an attracting equilibrium, stay near a repelling branch of equilibria for long intervals of time before finally returning to a neighborhood of the attracting equilibrium (or of another attracting state). As a result, canard solutions exhibit bifurcation delay. In this article, we analyze some linear and nonlinear reaction-diffusion equations of singular perturbation type, showing that solutions of these systems also exhibit bifurcation delay and are, hence, canards. Moreover, it is shown for both the linear and the nonlinear equations that the exit time may be either spatially homogeneous or spatially inhomogeneous, depending on the magnitude of the diffusivity.
Keywords: PDEs;parabolic equations;RD equations - ODEs;asymptotic theory;singular perturbations;turning point theory - Dynamical systems;bifurcations;bifurcations of singular points;canards
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ISSN: 1079-9389
e-ISSN: 1079-9389
ISI #: 000275910500005
Category: A1
Type: Journal Contribution
Validations: ecoom 2011
Appears in Collections:Research publications

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