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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

f (R, T) = f (R) plus lambda T gravity models as alternatives to cosmic acceleration

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Author(s):
Sahoo, P. K. [1] ; Moraes, P. H. R. S. [2] ; Sahoo, Parbati [1, 3] ; Bishi, Binaya K.
Total Authors: 4
Affiliation:
[1] Birla Inst Technol & Sci Pilani, Dept Math, Hyderabad Campus, Hyderabad 500078 - India
[2] ITA, Dept Fis, BR-12228900 Sao Jose Dos Campos, SP - Brazil
[3] Lovely Profess Univ, Dept Math, Jalandhar 144401, Punjab - India
Total Affiliations: 3
Document type: Journal article
Source: EUROPEAN PHYSICAL JOURNAL C; v. 78, n. 9 SEP 15 2018.
Web of Science Citations: 0
Abstract

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)

FAPESP's process: 15/08476-0 - Gravitational waves in f(R,T) theories: polarization states and astrophysical sources
Grantee:Pedro Henrique Ribeiro da Silva Moraes
Support type: Scholarships in Brazil - Post-Doctorate