Gravitação unimodular na teoria de Brans-Dicke.
Nenhuma Miniatura disponível
Data
2022-12-09
Autores
Almeida, Alexandre Magno Rodrigues
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Federal do Espírito Santo
Resumo
We propose a unimodular version of the Brans–Dicke theory designed with a constrained Lagrangian formulation. The resulting field equations are traceless and the theory fails to be invariant under general diffeomorphisms. The vacuum solutions in the cosmological background reproduce the corresponding solutions of the usual Brans–Dicke theory but with a cosmological constant term. A perturbative analysis of the scalar modes is performed and stable and unstable configurations appear, in contrast with the Brans–Dicke case for which only stable configurations occur. On the other hand, tensorial modes in this theory remain the same as in the traditional Brans–Dicke theory.
Descrição
Palavras-chave
Cosmologia , Gravitação , Unimodular , Brans-Dicke