Gravitação unimodular na teoria de Brans-Dicke.
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 correspondin...
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| Tipo de recurso: | tesis de maestría |
| Estado: | Versión publicada |
| Fecha de publicación: | 2022 |
| País: | Brasil |
| Institución: | Universidade Federal do Espírito Santo (UFES) |
| Repositorio: | Repositório Institucional da Universidade Federal do Espírito Santo (riUfes) |
| Idioma: | portugués |
| OAI Identifier: | oai:repositorio.ufes.br:10/16573 |
| Acceso en línea: | http://repositorio.ufes.br/handle/10/16573 |
| Access Level: | acceso abierto |
| Palabra clave: | Cosmologia Gravitação Unimodular Brans-Dicke subject.br-rjbn Física |
| Sumario: | 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. |
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