| Texto completo | |
| Autor(es): |
Sahoo, P. K.
;
Moraes, P. H. R. S.
;
Sahoo, Parbati
;
Bishi, Binaya K.
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | EUROPEAN PHYSICAL JOURNAL C; v. 78, n. 9, p. 10-pg., 2018-09-15. |
| Resumo | |
This article presents cosmological models that arise in a subclass of f (R, T) = f(R) + f (T) gravity models, with different f (R) functions and fixed T-dependence. That is, the gravitational lagrangian is considered as f (R, T) = f (R) + lambda T, with constant lambda. Here R and T represent the Ricci scalar and trace of the stress-energy tensor, respectively. The modified gravitational field equations are obtained through the metric formalism for the Friedmann-Lemaitre-Robertson-Walker metric with signature (+,-, -, -). We work with f (R) = R + alpha R-2- mu(4)/R, f (R) = R + k ln(gamma R) and f (R) = R + me([-nR]), with alpha, mu, k, gamma, m and n all free parameters, which lead to three different cosmological models for our Universe. For the choice of lambda = 0, this reduces to widely discussed f (R) gravity models. This manuscript clearly describes the effects of adding the trace of the energy-momentum tensor in the f (R) lagrangian. The exact solution of the modified field equations are obtained under the hybrid expansion law. Also we present the Om diagnostic analysis for the discussed models. (AU) | |
| Processo FAPESP: | 15/08476-0 - Ondas gravitacionais em teorias f(R,T): estados de polarização e fontes astrofísicas |
| Beneficiário: | Pedro Henrique Ribeiro da Silva Moraes |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |