A transition from a decelerated to an accelerated phase of the universe expansion from the simplest non-trivial polynomial function of T in the f (R, T) formalism

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Author(s):	Moraes, P. H. R. S. ^[1] ; Ribeiro, G. ^[2] ; Correa, R. A. C. ^[3] Total Authors: 3
Affiliation:	^[1] ITA Inst Tecnol Aeronaut, Dept Fis, BR-12228900 Sao Jose Dos Campos, SP - Brazil ^[2] FEG Fac Engn Guaratingueta, Dept Fis & Quim, BR-12516410 Guaratingueta, SP - Brazil ^[3] Univ Fed ABC, CCNH, BR-09210580 Santo Andre, SP - Brazil Total Affiliations: 3
Document type:	Journal article
Source:	ASTROPHYSICS AND SPACE SCIENCE; v. 361, n. 7 JUL 2016.
Web of Science Citations:	17
Abstract
In this work we present cosmological solutions from the simplest non-trivial polynomial function of T in f (R, T) theory of gravity, with R and T standing for the Ricci scalar and trace of the energy-momentum tensor, respectively. Although such an approach yields a highly nonlinear differential equation for the scale factor, we show that it is possible to obtain analytical solutions for the cosmological parameters. For some values of the free parameters, the model is able to predict a transition from a decelerated to an accelerated expansion of the universe and the values of the deceleration parameter agree with observation. (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