Abstract
We investigate, in a systematic fashion, coherent structures, or defects, which serve as interfaces between wave trains with possibly different wavenumbers in reaction-diffusion systems. We propose a classification of defects into four different defect classes which have all been observed experimentally. The characteristic distinguishing these classes is the sign of the group velocities of the wave trains to either side of the defect, measured relative to the speed of the defect. Using a spatial-dynamics description in which defects correspond to homoclinic and heteroclinic connections of an ill-posed pseudoelliptic equation, we then relate robustness properties of defects to their spectral stability properties. Last, we illustrate that all four types of defects occur in the one-dimensional cubic-quintic Ginzburg-Landau equation as a perturbation of the phase-slip vortex.
Original language | English (US) |
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Pages (from-to) | 1-68 |
Number of pages | 68 |
Journal | SIAM Journal on Applied Dynamical Systems |
Volume | 3 |
Issue number | 1 |
DOIs | |
State | Published - Feb 24 2004 |
Bibliographical note
Copyright:Copyright 2004 Elsevier B.V., All rights reserved.
Keywords
- Coherent structures
- Group velocity
- Pattern formation
- Spatial dynamics