Reconstruction of f(R, T) gravity describing matter dominated and accelerated phases

Details Reconstruction of f(R, T) gravity describing matter dominated and accelerated phases Reconstruction of f(R, T) gravity describing matter dominated and accelerated phases

2011-07-20

arxiv.org/abs/1107.3887v4

IJMPD 21, 1250003 (2012)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

14 pages, accepted for publication in International Journal of Modern Physics D (IJMPD)

Scientific paper

We investigate the cosmological reconstruction in modified f(R,T) gravity, where R is the Ricci scalar and T the trace of the stress-energy tensor. Special attention is attached to the case in which the function f is given by f (R, T) = f1 (R) + f2 (T). The use of auxiliary scalar field is considered with two known examples for the scale factor corresponding to an expanding universe. In the first example, where ordinary matter is usually neglected for obtaining the unification of matter dominated and accelerated phases with f(R)gravity, it is shown in this paper that this unification can be obtained without neglect ordinary matter. In the second example, as in f(R)gravity, model of f(R, T) gravity with transition of matter dominated phase to the acceleration phase is obtained. In both cases, linear function of the trace is assumed for f2(T) and it is obtained that f1(R) is proportional to a power of R with exponents depending on the input parameters.

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