Instability mechanisms of repelling peak solutions in a multi-variable activator-inhibitor system

Abstract

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.

12 pages, 8 figures

References in corpus (5)

• Branch Mode Selection during Early Lung Development
• Subcritical Turing bifurcation and the morphogenesis of localised patterns
• Simulations demonstrate a simple network to be sufficient to control branch point selection, smooth muscle and vasculature formation during lung branching morphogenesis
• Front motion and localized states in an asymmetric bistable activator-inhibitor system with saturation
• Origin of Jumping Oscillons in an Excitable Reaction-Diffusion System

Cited by in corpus (2)

• Front propagation and global bifurcations in a multivariable reaction-diffusion model
• Emergence of rogue-like waves in a reaction-diffusion system: Stochastic output from deterministic dissipative dynamics