Bifurcation of invariant tori of differential systems via higher order averaging theory

• Grant number: 20/14232-4
• Support type: Scholarships in Brazil - Doctorate
• Effective date (Start): April 01, 2021
• Effective date (End): March 31, 2025
• Field of knowledge: Physical Sciences and Mathematics - Mathematics - Geometry and Topology
• Principal researcher: Douglas Duarte Novaes
• Grantee: Pedro Campos Christo Rodrigues Pereira
• Home Institution: Instituto de Matemática, Estatística e Computação Científica (IMECC). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
• Associated research grant: 18/13481-0 - Geometry of control, dynamical and stochastic systems, AP.TEM

Abstract

Invariant manifolds are fundamental tools for understanding the qualitative behaviour of systems. Although the use of the averaging theory to find periodic orbits, a first example of non-trivial invariant sets, is well-established, there is still plenty to be done regarding the study of invariant sets of higher dimensions. In this area, Fenichel's Theory about the persistence of normally hyperbolic invariant manifolds under small perturbation is a well-established tool for the research concerning invariant sets. In this project, both theories, combined with continuation methods, will be employed simultaneously to the study of the existence of invariant tori in regularly perturbed differential systems. The main goal of this project is the generalization of recent results that ensure the existence of invariant sets from the analysis of the averaged system obtained by the averaging method. We hope firstly to establish more generally the correspondence between limit cycles of the averaged system and invariant tori of the original system. More general results arising from the application of the theory of normally hyperbolic invariant manifolds jointly with the averaging theory to the study of differential systems will be investigated subsequently. (AU)