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Invariant Sets in differential Dynamical Systems: Periodic orbits, Invariant Tori and Algebraic surfaces.

Grant number: 18/07344-0
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): October 01, 2018
Effective date (End): August 11, 2022
Field of knowledge:Physical Sciences and Mathematics - Mathematics - Geometry and Topology
Principal researcher:Marco Antônio Teixeira
Grantee:Murilo Rodolfo Cândido
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
Associated scholarship(s):19/05657-4 - Bifurcations of nested invariant tori and invariant sets of Lotka-Volterra differential systems, BE.EP.PD


This research project has mainly three work lines. First, we shall develop results in the context of averaging theory for detecting periodic orbits. This method has one of the main tools for detecting periodic orbits in differential systems. Recently, methods like Brouwer degree and Lyapunov--Schimdt reduction were incorporated into this theory widely improving the set of differential systems for which averaging theory can be applied. Our aim is to provide a criterion for determining the stability of non-hyperbolic periodic orbits detected by the recently formulated version of the averaging theorem.Moreover, we shall improve the averaging theory in order to make possible the detection of invariant tori in planar non-autonomous systems and tridimensional autonomous systems. These bifurcations are known as Neimark-Sacker bifurcation and we shall prove that they can be precisely detected by means averaging theory.Finally, we will use the algebraic invariant surfaces of a given differential system to describe its behavior providing, even, the description of its orbits at infinity. This will be done using the concept of weight homogeneous polynomial, characteristic courves, and Poincaré compactification.All results developed here will be applied to study relevant physical systems. For instance, the Rossler system, Maxwell-Bloch system, and the generalized Van der system. This project has the collaboration of important researchers from Brazil, Portugal and Spain.

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
CANDIDO, MURILO R.; NOVAES, DOUGLAS D.. On the torus bifurcation in averaging theory. Journal of Differential Equations, v. 268, n. 8, p. 4555-4576, . (18/07344-0, 19/05657-4, 18/16430-8, 18/13481-0, 19/10269-3)
CANDIDO, MURILO R.; NOVAES, DOUGLAS D.; VALLS, CLAUDIA. Periodic solutions and invariant torus in the Rossler system. Nonlinearity, v. 33, n. 9, . (19/05657-4, 19/10269-3, 18/07344-0, 18/16430-8)
CANDIDO, M. R.; LLIBRE, J.; VALLS, C.. New Symmetric Periodic Solutions for the Maxwell-Bloch Differential System. MATHEMATICAL PHYSICS ANALYSIS AND GEOMETRY, v. 22, n. 2, . (18/07344-0)

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