Cosmological evolution in f(R,T) theory with collisional matter

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 containing, besides 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 Friedmann-Robertson-Walker equations and the equation of continuity and obtain a differential equation in H(z), and we solve it numerically for studying the evolution of the cosmological parameters. Two f(R,T) models are considered. The results with collisional matter are compared with the ones of the. cold dark matter model, and also with the model where only noncollisional matter exists. The curves show that the models are acceptable because the values found for w(eff) are consistent with observed data.