Abstract
We prove structural stability under perturbations for a class of discrete-time dynamical systems near a non-hyperbolic fixed point. We reformulate the stability problem in terms of the well-posedness of an infinite-dimensional nonlinear ordinary differential equation in a Banach space of carefully weighted sequences. Using this, we prove existence and regularity of flows of the dynamical system which obey mixed initial and final boundary conditions. The class of dynamical systems we study, and the boundary conditions we impose, arise in a renormalization group analysis of the 4-dimensional weakly self-avoiding walk and the 4-dimensional n-component |φ|4 spin model.
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Communicated by Abdelmalek Abdesselam.
Dedicated to the memory of Pierluigi Falco (1977–2014)
This work was supported in part by NSERC of Canada.
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Bauerschmidt, R., Brydges, D.C. & Slade, G. Structural Stability of a Dynamical System Near a Non-Hyperbolic Fixed Point. Ann. Henri Poincaré 16, 1033–1065 (2015). https://doi.org/10.1007/s00023-014-0338-0
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DOI: https://doi.org/10.1007/s00023-014-0338-0