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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Uso do Einstein Toolkit na Gravidade Telelparalela

Varela Gonzalez, Hailleen Gisell 18 July 2016 (has links)
Dissertação (mestrado)—Universidade de Brasília, Instituto de Física, Programa de Pós-Graduação em Física, 2016. / Submitted by Fernanda Percia França (fernandafranca@bce.unb.br) on 2016-09-20T16:09:21Z No. of bitstreams: 1 2016_HailleenGisellVarelaGonzalez.pdf: 1485857 bytes, checksum: ff6db3ab3e54ffc0ad1ec17200cd56b7 (MD5) / Approved for entry into archive by Raquel Viana(raquelviana@bce.unb.br) on 2016-10-11T22:14:39Z (GMT) No. of bitstreams: 1 2016_HailleenGisellVarelaGonzalez.pdf: 1485857 bytes, checksum: ff6db3ab3e54ffc0ad1ec17200cd56b7 (MD5) / Made available in DSpace on 2016-10-11T22:14:39Z (GMT). No. of bitstreams: 1 2016_HailleenGisellVarelaGonzalez.pdf: 1485857 bytes, checksum: ff6db3ab3e54ffc0ad1ec17200cd56b7 (MD5) / O Teleparalelismo Equivalente à Relatividade Geral, mostra-se como uma alternativa a formulação métrica da Relatividade Geral, principalmente por permitir escrever, através de seu formalismo Lagrangiano, expressões consistentes para a energia e o momento angular gravitacionais. No presente trabalho foi calculada a densidade de energia gravitacional de uma estrela de nêutrons fazendo uso do formalismo teleparalelo em conjunto com a ferramenta numérico-computacional conhecida como Einstein Toolkit. Esta ferramenta fornece uma rotina já pré-definida onde são utilizadas as equações TOV para simular as características das estrelas de nêutrons, e que adicionalmente implementa o método evolutivo 3+1 BSSN. Finalmente, se mostra a variação da densidade de energia ao longo dos eixos, evidenciando sua influencia na dinâmica da estrela. _________________________________________________________________________________________________ ABSTRACT / The teleparallel equivalent of general relativity shows itself as an alternative to the metric formulation of general relativity, particularly for allowing through its Lagrangian formalism, to write consistent expressions for gravitational energy and angular momentum. In this work it was calculated the gravitational energy density of a neutron star making use of the teleparallel formalism within the numeric computational infrastructure known as Einstein Toolkit. This tool provides a preset routine in which the TOV equations are used to simulate the neutron star features in addition to the implementation of the 3+1 BSSN evolution system. Finally it was showed the energy density variation along the axes showing its influence on the dynamics of the star.

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