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arXiv · 1912.06205

Local theory for spatio-temporal canards and delayed bifurcations

Daniele Avitabile·Mathieu Desroches·Romain Veltz·Martin Wechselberger
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Abstract

We present a rigorous framework for the local analysis of canards and slow passages through bifurcations in a wide class of infinite-dimensional dynamical systems with time-scale separation. The framework is applicable to models where an infinite-dimensional dynamical system for the fast variables is coupled to a finite-dimensional dynamical system for slow variables. We prove the existence of centre-manifolds for generic models of this type, and study the reduced, finite-dimensional dynamics near bifurcations of (possibly) patterned steady states in the layer problem. Theoretical results are complemented with detailed examples and numerical simulations covering systems of local- and nonlocal-reaction diffusion equations, neural field models, and delay-differential equations. We provide analytical foundations for numerical observations recently reported in literature, such as spatio-temporal canards and slow-passages through Hopf bifurcations in spatially-extended systems subject to slow parameter variations. We also provide a theoretical analysis of slow passage through a Turing bifurcation in local and nonlocal models.

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Daniele Avitabile, Mathieu Desroches, Romain Veltz, Martin Wechselberger. 2019-12-12. Local theory for spatio-temporal canards and delayed bifurcations. https://doi.org/10.1137/19m1306610

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