Math. Model. Nat. Phenom.
Volume 8, Number 5, 2013Bifurcations
|Page(s)||131 - 154|
|Published online||17 September 2013|
Instabilities and Dynamics of Weakly Subcritical Patterns
Department of Physics, University of California,
⋆ Corresponding author. E-mail: firstname.lastname@example.org
The bifurcation to one-dimensional weakly subcritical periodic patterns is described by the cubic-quintic Ginzburg-Landau equation
At = µA + Axx + i(a1|A|2Ax + a2A2Ax*) + b|A|2A - |A|4A.
These periodic patterns may in turn become unstable through one of two different mechanisms, an Eckhaus instability or an oscillatory instability. We study the dynamics near the instability threshold in each of these cases using the corresponding modulation equations and compare the results with those obtained from direct numerical simulation of the equation. We also study the stability properties and dynamical evolution of different types of fronts present in the protosnaking region of this equation. The results provide new predictions for the dynamical properties of generic systems in the weakly subcritical regime.
Mathematics Subject Classification: 34E13 / 37G40 / 37M05
Key words: bifurcation / cubic-quintic Ginzburg-Landau equation / weakly subcritical periodic pattern
© EDP Sciences, 2013
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