Objetos astrofísicos compactos: um teste para as teorias alternativas da gravitação.

• Ano de defesa: 2016
• Autor(a) principal: Oliveira, Adriano Mesquita
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Espírito Santo; BR; Doutorado em Física; Centro de Ciências Exatas; UFES; Programa de Pós-Graduação em Física
• Palavras-chave em Português: Cosmology; Gravitation; General Relativity; Alternatives Theory; Neo-Newtonian; Neutron Stars; Cosmologia; Gravitação; Relatividade Geral; Teorias modificadas; Neo-Newtoniana; Rastall; Estrela de nêutrons; Física; 53
• Link de acesso: http://repositorio.ufes.br/handle/10/7376

Neutron stars are compact objects in which gravitational forces are supported by neutron degenerescence and other repulsive forces among nucleons, which compose the inner of these structures. This structure borns with the end of nuclear fusion process followed by a exploding process, called supernova. In addition, its inner matter components are said to be under extreme conditions. The density in such structures is of order of nuclear saturation. In this context the use of general relativity is essential. In general, Einsteins theory together with an appropriate equation of state is used to describe the equilibrium os such stars. However, the lack of proper knowledge on the matter behavior under such extreme conditions (and the actual physics behind this situation), makes room to use alternatives gravity theories to describe such stars. In this context, in this thesis we will study the consequences ( concerning the neutron star structure) when we use some alternatives to the Newtonss and Einsteins theories. Thus we i) study an alternative for implementing relativistic corrections at the Newtonian level, ii) propose a possible limitation for Rastalls parameter and the vacuum solution for this theory and iii) analyse the relevance of the different terms of the standrd TOV equation via a proposed ad hoc parameterization.