Mestrado em Física

URI Permanente para esta coleção

http://repositorio.ufes.br/handle/10/17494

Nível: Mestrado Acadêmico
Ano de início: 1992
Conceito atual na CAPES: 4
Ato normativo: Parecer CES/CNE nº 487/2018, homologado pela Port. MEC 609, publicado no DOU em 18/03/2019.
Periodicidade de seleção: Semestral
Área(s) de concentração: Física
Url do curso: https://fisica.ufes.br/pt-br/pos-graduacao/PPGFis/detalhes-do-curso?id=1508

Navegar

Navegando Mestrado em Física por Autor "Alvarenga, Flávio Gimenes"

Agora exibindo 1 - 5 de 5
  • Nenhuma Miniatura disponível
    Item
    A classificação de Bianchi e a construção de Taub das métricas cosmológicas anisotrópicas
    (Universidade Federal do Espírito Santo, 2024-07-15) Scardini, Lucas Oliveira; Gonçalves, Sergio Vitorino de Borba ; https://orcid.org/; http://lattes.cnpq.br/; https://orcid.org/; http://lattes.cnpq.br/; Monerat, Germano Amaral; https://orcid.org/; http://lattes.cnpq.br/; Alvarenga, Flávio Gimenes; https://orcid.org/; http://lattes.cnpq.br/; Spalenza, Wesley; https://orcid.org/; http://lattes.cnpq.br/
    The study of the cosmos is of utmost importance for understanding the origin of the Universe. One of the foundations in these studies is the metric used, which is commonly homogeneous and isotropic. However, there are works that utilize anisotropic or inhomogeneous metrics. Anisotropic metrics have been divided into different types by the work of Abraham Taub, who based his classification on Luigi Bianchi’s classification of anisotropic manifolds. This dissertation has two objectives: the first is to construct anisotropic metrics starting with a simple review of general relativity. The second is to demonstrate the importance of studying models that do not adhere to the cosmological principle
  • Nenhuma Miniatura disponível
    Item
    Confrontando cosmologias newtoniana e neo-newtoniana através do processo de formação de estruturas
    (Universidade Federal do Espírito Santo, 2007-09-21) Velten, Hermano Endlich Schneider; Alvarenga, Flávio Gimenes; Gonçalves, Sérgio Vitorino de Borba; Silva, Saulo Carneiro de Souza
    If we utilize the hidrodynamical equations in the study of the Universe we obtain a New-tonian cosmology. However, if we consider the effects of the inercial pressure and thedistinction between gravitacional mass and inercial mass it is possible to obtain a newset of hidrodynamical equations that we call neo-Newtoniancosmology. In this work westudy the aplicabillity of these two approach in structure formation theory throught amodel constituited by baryonic matter and Chaplygin gas. Weconfront the theoreticalpower spectrum of Newtonian cosmology and neo-Newtonian Cosmology with the 2dF-GRS observational data. The purpose of this analysis is to obtain the advantage of eachapproach. Moreover, we search the origin of the oscillations and divergences observed inthe Chaplygin gas power spectrum.
  • Nenhuma Miniatura disponível
    Item
    Modelo acústico análogo ao buraco negro de Schwarzschild
    (Universidade Federal do Espírito Santo, 2010-07-29) Toniato, Júnior Diniz; Gonçalves, Sérgio Vitorino de Borba; Monerat, Germano Amaral; Constantinidis, Clisthenis Ponce; Alvarenga, Flávio Gimenes
    There isn t experimental evidences that can validate the results of black holes termodynamics. This because the radiation emitted by the black hole, predicted by theory, it is almost impossible to be detected due to its low value of magnitude. In the search for clues that could validate the existence of this radiation, the study of analog models to those objetcs has grown considerably in recent decades. They allow the idealization of experiments in labs that would be extremely complicate to be done directly with the gravitational systems. A fluid in moviment can act on the sound the same way that curved space-time can influence on light trajectory in the general relativity. So, one can describe the propagation these sound waves through an effective metric, under wich they will follow null geodesics. This thesis makes a review of these studies focusing in an analogy to Schwarzschild black hole using an acoustic system, showing its advantages and limitations when applied in the study of Hawking s theory
  • Nenhuma Miniatura disponível
    Item
    O modelo cosmológico de Kantowski-Sachs
    (Universidade Federal do Espírito Santo, 2021-02-23) Silva, Breno Barreto da; Gonçalves, Sergio Vitorino de Borba; https://orcid.org/0000000285709750; http://lattes.cnpq.br/4992784379693871; https://orcid.org/0000000173460129; http://lattes.cnpq.br/8497753547288933; Alvarenga, Flávio Gimenes; https://orcid.org/0000-0002-7579-9561; http://lattes.cnpq.br/7169430092692431; Monerat, Germano Amaral; https://orcid.org/0000-0003-2536-1171; http://lattes.cnpq.br/5031014907752547
    This work seeks to solve Einstein’s equations for the Kantowski-Sachs metric in a environment containing barotropic fluid coupled to a scalar field and using a relationship between the scale factors of that metric. To achieve this goal, it was necessary to study and address the RobertsonWalker metric, the Einstein-Hilbert action, the Einstein equations, the various moment-energy tensors and the Friedmann equations. We also studied the following fluids: dust, stiff matter, radiation, cosmic strings and vacuum, and their respective equations of state. And finally, we analyze the calculations of the Kantowski-Sachs article for dust and the Adhav article that solves Einstein’s equations for stiff matter with the Kantowski-Sachs metric having a relationship between the scale factors.
  • Nenhuma Miniatura disponível
    Item
    Quantização de Laços no Modelo BF em 2+1 dimensões
    (Universidade Federal do Espírito Santo, 2010-03-09) Mendonça, Diego Cézar Monteiro de; Constantinidis, Clisthenis Ponce; Piguet, Olivier; Alvarenga, Flávio Gimenes; Helayël Neto, José; Piguet, Olivier; Constantinidis, Clisthenis Ponce
    The goal of this paper is to serve as an introductory text to the following topics: canonical quantization, loop quantization, and the BF model. To this end, we develop appropriate mathematical tools for treating a topological gauge theory of the general Yang-Mills type to formulate a covariant action and study its symmetries via the canonical Dirac quantization method, also known as the Hamiltonian bound method. This method is developed extensively, although it retains its introductory character, for the case of the 2+1 dimensional BF model, which we then quantize via bonds and find identifications of this whole process with the theory of general relativity expressed as a gauge theory. Finally, we will see how the quantum mechanics of these gauge theories develops by describing the basis for our state functions which is called the spin network, as well as the dynamics of these loop quantized theories which is described by the formalism of spin foams and also the calculation of some observables associated with our states.