Local theory for spatio-temporal canards and delayed bifurcations
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.
Cite
@article{arxiv.1912.06205,
title = {Local theory for spatio-temporal canards and delayed bifurcations},
author = {Daniele Avitabile and Mathieu Desroches and Romain Veltz and Martin Wechselberger},
journal= {arXiv preprint arXiv:1912.06205},
year = {2020}
}