Cosmologia dilatônica no regime de acoplamento fraco em teoria de gravidade modificada F(R,T)

• Ano de defesa: 2024
• Autor(a) principal: Borges, Carlos Henrique Araújo Bonfim
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal da Paraíba; Brasil; Física; Programa de Pós-Graduação em Física; UFPB
• Palavras-chave em Português: Gravidade F(R,T); Campo dilatônico; Acoplamento fraco; Ação efetiva; gravity F(R, T); Dilatonic field; Weak coupling; Effective action; CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA
• Link de acesso: https://repositorio.ufpb.br/jspui/handle/123456789/33382

General Relativity has always been presented as a theory consistent with observational data. However, for a unified description of cosmic inflation and dark energy, it is necessary to admit a more general action to the detriment of the Einstein-Hilbert action. In this research, we will address a proposal in modified gravity theory F(R, T) using the dilaton as a scalar field and admitting cosmological scenarios related to the effective action. Thus, we will make adjustments in appropriate parameters in order to reproduce scenarios for the universe dominated by dark energy, whose model addresses the tension H0 and the matter-radiation equipartition redshift zeq. This proposal consists of using numerical methods to describe the results and compare them with recent observational data.