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Talk abstract:
The Complex Ginzburg-Landau Equation as a Pertubation
of the Nonlinear Schrödinger Equation: A Melnikov Approach
David Levermore, University of Arizona
The generalized complex Ginzburg-Landau (CGL) equation has a long
history in physics as a generic amplitude equation near the onset of
instabilities that lead to chaotic dynamics in numerous physical
systems. We study it as a damped-driven perturbation of the nonlinear
Schrödinger (NLS) equation, which has a Hamiltonian structure. We
give conditions that quasi-periodic and homoclinic structures in the
NLS phase space must satisfy if they are to persist under the CGL
perturbation. We show that for NLS rotating and traveling waves,
these conditions genericly determine which of them persist. When the
CGL has a global Lyapunov function, a complete bifurcation analysis of
persisting solutions can be carried out and their stability analyzed.
When the focusing NLS equation is perturbed, we show that none of the
NLS orbits homoclinic to rotating waves persist, but rather distinct
homoclinic structures are produced by the CGL perturbation.
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