Instability mechanisms of repelling peak solutions in a multi-variable activator–inhibitor system
Copyright policy )Instability mechanisms of repelling peak solutions in a multi-variable activator–inhibitor system
We study the linear stability properties of spatially localized single- and multi-peak states generated in a subcritical Turing bifurcation in the Meinhardt model of branching. In one spatial dimension, these states are organized in a foliated snaking structure owing to peak–peak repulsion but are shown to be all linearly unstable, with the number of unstable modes increasing with the number of peaks present. Despite this, in two spatial dimensions, direct numerical simulations reveal the presence of stable single- and multi-spot states whose properties depend on the repulsion from nearby spots as well as the shape of the domain and the boundary conditions imposed thereon. Front propagation is shown to trigger the growth of new spots while destabilizing others. The results indicate that multi-variable models may support new types of behavior that are absent from typical two-variable models.
- University of California System United States
- University of California, Berkeley United States
- Ben-Gurion University of the Negev Israel
- University of California, San Francisco United States
- Department of Physics University of California San Diego United States
Dynamical systems and ergodic theory, FOS: Physical sciences, Pattern Formation and Solitons (nlin.PS), Nonlinear Sciences - Pattern Formation and Solitons, Ordinary differential equations
Dynamical systems and ergodic theory, FOS: Physical sciences, Pattern Formation and Solitons (nlin.PS), Nonlinear Sciences - Pattern Formation and Solitons, Ordinary differential equations
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