We study the evolution of the cosmological parameters, namely, the deceleration parameter q(z) and the parameter of effective equation of state in a universe contains, besides the ordinary matter and dark energy, a self-interacting (collisional matter), in the generalized f(R,T) theory of gravity, where R and T are the curvature scalar and the trace of the energy-momentum tensor, respectively. We use the generalized FRW equations the equation of continuity and obtain a differential equation of second order in H(z), and solve it numerically for studying the evolution of the cosmological parameters. Two f(R,T) models are considered and the results with collisional matter are compared with the ones of the ΛCDM model, and also with the model where there exists only non-collisional matter. The curves show that the models are acceptable because the values found for weff are consistent with the observational data.
@article{arxiv.1504.05496,
title = {Cosmological Evolution in f(R,T) theory with Collisional Matter},
author = {E. H. Baffou and M. J. S. Houndjo and M. E. Rodrigues and A. V. Kpadonou and J. Tossa},
journal= {arXiv preprint arXiv:1504.05496},
year = {2015}
}