Orientador: Edmundo Capelas de Oliveira / Dissertação (mestrado profissional) - Universidade Estadual de Campinas, Instituto de Matemática, Estatística e Computação Científica / Made available in DSpace on 2018-08-17T12:38:24Z (GMT). No. of bitstreams: 1 Nakamura_MarciaMayumi_M.pdf: 683963 bytes, checksum: 0fbcfd687c511e4845ba13501415f91e (MD5) Previous issue date: 2011 / Resumo: Efetuamos um estudo sistemático envolvendo o caso geral de uma equação diferencial parcial, linear, de segunda ordem, com n variáveis independentes. Particularizamos para o caso bidimensional, n = 2, duas variáveis independentes. Utilizamos o método de separação de variáveis para conduzir esta equação diferencial parcial a um conjunto de duas equações diferenciais ordinárias. Introduzimos o método de Frobenius a partir de uma particular equação diferencial ordinária, a chamada equação de Bessel. Como aplicação, apresentamos e discutimos o chamado problema de forcas centrais, em particular, estudamos o problema de Kepler de onde emerge naturalmente o problema de classificação de uma cônica, onde a elipse merece tratamento destacado / Abstract: We develop a systematic study involving the general case of a second order linear partial differential equation with n independent variables. We particularize to the bidimensional case, n = 2, involving two independent variables. In this case, we present the method of separating variables to develop the partial differential equation into a set of two differential ordinary equations. We introduce the Frobenius method using a particular ordinary di1'l'erential equation, the so-called Bessel equation. As an application, we present and discuss the so-called central forces and as particular case, we study the Kepler problem from which naturally emerges the problem of the classification of a conic, where ellipse deserves special treatment / Mestrado / Equação Diferenciais / Mestre em Matemática

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Mémoire numérisé par la Division de la gestion de documents et des archives de l'Université de Montréal

Dumb holes (also known as acoustic black holes) are fluid flows which include an "acoustic horizon:" a surface, analogous to a gravitational horizon, beyond which sound may pass but never classically return. Soundwaves in these flows will therefore experience "effective geometries" which are identical to black hole spacetimes up to a conformal factor. By adjusting the parameters of the fluid flow, it is possible to create an effective geometry which is conformal to the Anti-de Sitter black hole spacetime- a geometry which has recieved a great deal of attention in recent years due to its conjectured holographic duality to Conformal Field Theories. While we would not expect an acoustic analogue of the AdS-CFT correspondence to exist, this dumb hole provides a means, at least in principle, of experimentally testing the theoretical properties of the AdS spacetime. In particular, I have calculated the quasinormal mode spectrum of this acoustic geometry. / Graduate / 0986 / 0753 / jpbabb@yahoo.ca