Gravidade f(R) e a energia escura de Tsallis

• Ano de defesa: 2021
• Autor(a) principal: Ens, Peter Silva
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Mato Grosso; Brasil; Instituto de Física (IF); UFMT CUC - Cuiabá; Programa de Pós-Graduação em Física
• Palavras-chave em Português: Gravitação; f(R); Tsallis; Energia escura; CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA; Gravitation; Dark energy
• Link de acesso: http://ri.ufmt.br/handle/1/4959

This dissertation obtains results, which describe the evolution of the universe, by combining a modified theory of gravitation with an alternative form for the holographic density of dark energy. Starting with a review of how Einstein’s equations can be obtained from a variational principle. After that, it presents one of the most common ways of modifying general relativity (f(R)) and its equations of motion. Then Tsallis’ proposal for a new form of dark energy is presented. Finally, these areas are joined in a numerical calculation in order to obtain solutions, for the scale factor and the state parameter, for multiple cases and to analyze such results.