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Doctoral Thesis
DOI
https://doi.org/10.11606/T.55.2006.tde-02022007-093739
Document
Author
Full name
Benito Frazão Pires
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2006
Supervisor
Committee
Vidalon, Carlos Teobaldo Gutierrez (President)
Brandão, Daniel Smania
Galvez, Americo Lopez
Scardua, Bruno Cesar Azevedo
Teixeira, Marco Antonio
Title in Portuguese
Estabilidade assintótica e estrutural de campos vetoriais
Keywords in Portuguese
Closing Lemma
connecting lemma
estabilidade assintótica
estabilidade estrutural
recorrência
Abstract in Portuguese
O objetivo deste trabalho é provar um Closing Lema Parcial para variedades bidimensionais compactas, orientáveis ou não--orientáveis. Para enunciá--lo, considere um campo vetorial \linebreak $X\in\mathfrak^r(M)$, $r\ge 2$, de classe $C^r$ em uma variedade bidimensional compacta $M$, e seja $\Sigma$ um segmento transversal a $X$ passando por um ponto recorrente não--trivial $p$ de $X$. Seja $P:\Sigma\to\Sigma$ a correspondente transformação de primeiro retorno. O primeiro resultado deste trabalho consiste em mostrar que se $P$ tem a propriedade de que para todo $n\ge N$ e $x\in{m dom}\,(P^n)$, $\vert DP^n(x)\vert<\lambda$, onde $N\in\N$ e $0<\lambda<1$, então existe um campo vetorial $Y$ arbitrariamente próximo de $X$ na topologia $C^r$ tendo uma trajetória periódica passando por $p$. O segundo resultado consiste em apresentar condições, sobre os expoentes de Lyapunov de $P$, para que $\vert DP^n\vert<\lambda$ para todo $n\ge N$. Nesta tese, também incluímos um resultado sobre a estabilidade assintótica no infinito de campos planares diferenciáveis, mas não necessariamente de classe $C^1$.
Title in English
Asymptotic and Structural Stability of Vector Fields
Keywords in English
asymptotic stability
Closing Lemma
connecting Lemma
recurrence
structural stability
Abstract in English
The aim of this work is to provide a Partial $C^r$ Closing Lemma for compact surfaces, orientable or non--orientable. To state it, let $X\in\mathfrak^r(M)$, $r\ge 2$, be a $C^r$ vector field on a compact surface $M$ and let $\Sigma$ be a transverse segment to $X$ passing through a non--trivial recurrent point $p$ of $X$. Let $P:\Sigma\to\Sigma$ be the corresponding first return map. The first result of this work consists in showing that if $P^n$ has the property that for all $n\ge N$ and $x\in{m dom}\,(P^n)$, $\vert DP^n(x)\vert<\lambda$, where $N\in\N$ e $0<\lambda<1$, then there exists a vector field $Y$ arbitrarily close to $X$ in the $C^r$ topology such that $p$ is a periodic point of $Y$. The second result consists in presenting sufficient conditions, upon the Lyapunov exponents of $P$, so that $\vert DP^n\vert<\lambda$ for all $n\ge N$. In this thesis, we also include a result concerning the asymptotic stability at infinity of planar differentiable vector fields, not necessarily of class $C^1$.
 
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teserevisada.pdf (412.27 Kbytes)
Publishing Date
2007-02-23
 
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