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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Evading the non-continuity equation in the f (R, T) cosmology

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Autor(es):
Moraes, P. H. R. S. [1] ; Correa, R. A. C. [1] ; Ribeiro, G. [1, 2]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] ITA, Dept Fis, BR-12228900 Sao Paulo - Brazil
[2] Univ Estadual Paulista, UNESP, Dept Fis & Quim, BR-12516410 Sao Paulo - Brazil
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: EUROPEAN PHYSICAL JOURNAL C; v. 78, n. 3 MAR 7 2018.
Citações Web of Science: 7
Resumo

We present a new approach for the f (R, T) gravity formalism, by thoroughly exploring the extra terms of its effective energy-momentum tensor T-mu nu(eff), which we name (T) over tilde (mu nu), so that T-mu nu(eff) = T-mu nu + (T) over tilde (mu nu), with T-mu nu. being the usual energy-momentum tensor of matter. Purely from the Bianchi identities, we obtain the conservation of both parts of the effective energy-momentum tensor, rather than the non-conservation of T-mu nu, originally occurring in the f (R, T) theories. In this way, the intriguing scenario of matter creation, which still lacks observational evidence, is evaded. One is left, then, with two sets of cosmological equations to be solved: the Friedmann-like equations along with the conservation of T-mu nu and along with the conservation of (T) over tilde (mu nu). We present a physical interpretation for the conservation of (T) over tilde (mu nu), which can be related to the presence of stiff matter in the universe. The cosmological consequences of this approach are presented and discussed as well as the benefits of evading the matter energy-momentum tensor non-conservation. (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
Linha de fomento: Bolsas no Brasil - Pós-Doutorado