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Doctoral Thesis
DOI
https://doi.org/10.11606/T.45.2012.tde-19072012-200107
Document
Author
Full name
Bráulio Augusto Garcia
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2012
Supervisor
Committee
Zanata, Salvador Addas (President)
Carneiro, Mario Jorge Dias
Koropecki, Andrés
Salomão, Pedro Antonio Santoro
Tal, Fabio Armando
Title in Portuguese
Dinâmica de homeomorfismos homotópicos à Dehn twists
Keywords in Portuguese
conjunto de rotação
Dehn twists
dinâmica topológica
entropia
toro
Abstract in Portuguese
No presente trabalho apresentamos um estudo sobre a dinâmica de homeomorfismos do toro homotópicos à Dehn twists. No caso conservativo, provamos que se $f$ preserva área e tem um levantamento $\hat$ para o cilindro com fluxo zero, então, precisamente, ou $f$ é um homeomorfismo do anel, ou possui pontos no cilindro com velocidades verticais positiva e negativa, por iteradas de $\hat$. Isso resolve a conjectura de Boyland para essa classe de homotopia. Já no caso geral, mostramos um resultado análogo. Além disso, fornecemos uma condição extremamente simples que, quando satisfeita, implica que o conjunto de rotação vertical contém um intervalo e, portanto, que $f$ tem entropia topológica positiva.
Title in English
On the dynamics of homeomorphisms of the torus homotopic to Dehn twists.
Keywords in English
Dehn twist
entropy
rotation set
topological dynamics
torus
Abstract in English
The present thesis is concerned with the dynamics of homeomorphisms of the torus homotopic to Dehn twists. We prove that if $f$ is area preserving and it has a lift $\hat$ to the cylinder with zero flux, then either $f$ is an annulus homeomorphism, or there are points in the cylinder with positive vertical velocity and others with negative vertical velocity, for iterates of $\hat$. This solves a version of Boyland's conjecture to this setting. We extend some theorems we already obtained for Dehn twists with the area preservation hypothesis to a more general class. Finally, we also give a simple explicit condition which, when satisfied, implies that the vertical rotation set contains an interval and thus also implies positive topological entropy.
 
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Publishing Date
2012-08-23
 
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