Chan Mei Shan. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2001. / Includes bibliographical references (leaves 74-76). / Abstracts in English and Chinese. / Chapter 0 --- Introduction --- p.1 / Chapter 1 --- Preliminary --- p.9 / Chapter 1.1 --- Harmonic maps between Riemann Surfaces --- p.9 / Chapter 1.2 --- "Minkowski 3-spaces, M21" --- p.17 / Chapter 1.3 --- Preliminaries from analysis --- p.21 / Chapter 2 --- Holomorphic quadratic differentials --- p.27 / Chapter 2.1 --- Solution on the Poincare disk D --- p.28 / Chapter 2.2 --- Solution on the complex plane C --- p.37 / Chapter 3 --- Harmonic Diffeomorphisms into H2 --- p.46 / Chapter 3.1 --- The case from D onto D --- p.46 / Chapter 3.2 --- Open harmonic embeddings from C into H --- p.53 / Chapter 4 --- Open harmonic embeddings with polynomial Hopf differentials --- p.57 / Chapter 4.1 --- Proof of the theorem --- p.58 / Chapter 4.2 --- Open harmonic embeddings on C with fixed ideal polygonal images in H2 --- p.65 / Bibliography --- p.74

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1In this dissertation we work out in detail a new proposal to define rigorously a sector of loop quantum gravity at the diffeomorphism invariant level corresponding to homogeneous and isotropic cosmologies, and propose how to compare in detail the physics of this sector with that of loop quantum cosmology. The key technical steps we have completed are (a) to formulate conditions for homogeneity and isotropy in a diffeomorphism covariant way on the classical phase space of general relativity, and (b) to translate these conditions consistently using well-understood techniques to loop quantum gravity. To impose the symmetry at the quantum level, on both the connection and its conjugate momentum, the method used necessarily has similiarities to the Gupta-Bleuler method of quantizing the electromagnetic field. Lastly, a strategy for embedding states of loop quantum cosmology into this new homogeneous isotropic sector, and using this embedding to compare the physics, is presented. / Includes bibliography. / Dissertation (Ph.D.)--Florida Atlantic University, 2019. / FAU Electronic Theses and Dissertations Collection

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Thesis (Masters of Science for Teachers)--University of Missouri-Columbia, 2008. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on August 25, 2008) Vita. Includes bibliographical references.

Apresentamos duas propriedades genéricas para difeomorfismos conservativos da classe \'C POT.1\' sobre uma superfície compacta de dimensão dois. Obtemos uma limitação inferior para entropia topológica de difeomorfismos genéricos, e mostramos que tais difeomorfismos sempre possuem conjuntos invariantes fechados com órbitas densas e dimensão de Hausdorff dois / We present two generic properties of \'C POT.1\" area preserving diffeomorphisms of a two dimensional compact oriented surface. We obtain a lower bound for the topological entropy of a generic diffeomorphisms, and we show that such a diffeomorphism always has closed invariant sets with dense orbits and Hausdorff dimension two

Apresentamos duas propriedades genéricas para difeomorfismos conservativos da classe \'C POT.1\' sobre uma superfície compacta de dimensão dois. Obtemos uma limitação inferior para entropia topológica de difeomorfismos genéricos, e mostramos que tais difeomorfismos sempre possuem conjuntos invariantes fechados com órbitas densas e dimensão de Hausdorff dois / We present two generic properties of \'C POT.1\" area preserving diffeomorphisms of a two dimensional compact oriented surface. We obtain a lower bound for the topological entropy of a generic diffeomorphisms, and we show that such a diffeomorphism always has closed invariant sets with dense orbits and Hausdorff dimension two

Orientador: Carlos Eduardo Duran Fernandez / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Matematica, Estatistica e Computação Cientifica / Made available in DSpace on 2018-08-14T00:21:52Z (GMT). No. of bitstreams: 1 Speranca_LlohamDallagnol_M.pdf: 1442574 bytes, checksum: eec573204734790dd464f4ba0a79d6c5 (MD5) Previous issue date: 2009 / Resumo: Apresentaremos neste trabalho alguns dos modelos clássicos em geometria e topologia diferencial para algumas variedades diferenciáveis com o mesmo tipo homotópico de uma esfera. Em seguida apresentaremos construções mais recentes dos mesmos e algumas de suas propriedades. / Abstract: We show in this work some of the classical models in geometry and diferential topology for some diferentiable manifolds with the same homotopy type of the sphere. We follow with an exposition of recent work and some of its properties. / Mestrado / Topologia / Mestre em Matemática

Orientador: Eduardo Garibaldi / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Matemática Estatística e Computação Científica / Made available in DSpace on 2018-08-26T22:18:46Z (GMT). No. of bitstreams: 1 FerreiraJunior_LinoRamada_M.pdf: 1117729 bytes, checksum: 6c350ee703712b44bec62c6e67597138 (MD5) Previous issue date: 2015 / Resumo: Nesta dissertação, estudamos técnicas de otimização ergódica no contexto de uma dinâmica do tipo Anosov. Mostramos diferentes maneiras de abordar o problema de maximização da integral de potenciais holderianos definidos sobre um espaço métrico compacto na presença de uma dinâmica hiperbólica. Discutimos o formalismo termodinâmico sobre modelo expansivo, obtendo probabilidades maximizantes em temperatura nula. No caso hiperbólico, determinamos uma desigualdade cohomológica em um sistema anfidinâmico, da qual resulta subação lipschitziana para potenciais lipschitzianos associados a difeomorfismos de Anosov. Finalmente, argumentamos que probabilidades periódicas são maximizantes para abertos de funções na topologia lipschitziana / Abstract: In this master's thesis, we study ergodic optimization techniques in the context of an Anosov dynamical system. We present different approaches to the problem of maximization of the integral of Hölder potentials on a compact metric space in the presence of a hyperbolic dynamics. We discuss the thermodynamical formalism in an expansive model, obtaining maximizing probabilities at zero temperature. In the hyperbolic case, we determine a cohomological inequality in an amphidynamical system, from which follows a Lipschitz subaction for Lipschitz potentials associated with Anosov diffeomorphisms. Finally, we argue that periodic probabilities are maximizing for open sets of functions in the Lipschitz topology / Mestrado / Matematica / Mestre em Matemática

[pt] Automorfismos genéricos de cubos com alças (handlebodies) aparecem do estudo de classes the isotopia de automorfismos de variedades orientáveis de dimensão três. Automorfismos genéricos permanecem como uma das partes menos entendidas desse estudo.Dado um automorfismo genérico de um cubo com alças, é conhecida uma forma de se construir uma laminação bidimensional que é invariante pelo automorfismo. A essa laminação se associa um fator de crescimento. É sabido que, no caso de tal fator de crescimento ser minimal - uma característica importante, pois mede a complexidade essencial do automorfismo - a laminação deve gozar de uma certa propriedade de incompressibilidade. Nessa tese mostramos que o processo de se achar uma laminação com tal propriedade é algoritmico. Por outro lado, mostramos que tal propriedade não garante que o respectivo fator de crescimento seja minimal. Propomos uma outra propriedade, tensão transversal, mais forte que incompressibilidade, que conjecturamos também ser condição necessária para que o fator de crescimento seja minimal. Provamos a conjectura em alguns casos.Além dos resultados mencionados acima, desenvolvemos métodos para gerar automorfismos genéricos de cubos com alcas, que usamos para apresentar alguma variedade de exemplos. / [en] Generic automorphisms of handlebodies appear naturally in the study of isotopy classes of automophisms of orientable three-dimensional manifolds. Generic automorphisms remain as one of the least understood parts of this study. Given a generic automorphism of a handlebody one can construct a bidimensional lamination that is invariant under the automorphism. There is a growth rate associated to this lamination. It is known that, when this growth rate is minimal among all possible choices (an important property, for it measures the essential complexity of the automorphism), the lamination must have a certain incompressibility property. On this thesis we show that the process of finding a lamination with such a property is algorithmic. On the other hand, we show that this said incompressibility property is not sufficient for the minimality of the growth rate. We propose a stronger property, which we called transverse tightness, and conjecture that it is a necessary condition for the growth rate to be minimal. We prove the conjecture in some particular cases. In addition to the results mentioned above, we develop methods to generate generic automorphisms of handlebodies, which we use to present some variety of examples.