Abstract
We study the cosmic evolution of non-minimally coupled f ( R , T ) gravity in the presence of matter fluids consisting of collisional self-interacting dark matter and radiation. We study the cosmic evolution in the presence of collisional matter, and we compare the results with those corresponding to non-collisional matter and the Λ -cold-dark-matter ( Λ CDM) model. Particularly, for a flat Friedmann–Lema i ^ tre–Robertson–Walker Universe, we study two non-minimally coupled f ( R , T ) gravity models and we focus our study on the late-time dynamical evolution of the model. Our study is focused on the late-time behavior of the effective equation of the state parameter ω e f f and of the deceleration parameter q as functions of the redshift for a Universe containing collisional and non-collisional dark matter fluids, and we compare both models with the Λ CDM model. As we demonstrate, the resulting picture is well accommodated to the latest observational data on the basis of physical parameters.
Highlights
Recent observations of the accelerated cosmic expansion [1,2] coming from Type Ia supernovae, and the confirmation of the B-mode power spectrum during the early-time inflationary era [3], have utterly changed the perspective of theoretical cosmologists with regard to the evolution of the Universe.The main aim and challenge is to find a unified description of the early and late-time eras, within the same theoretical framework
From the latest observational data, we know that the Universe made the deceleration to acceleration transition at a low redshift value zt = 0.46 ± 0.13 [42]. This transition from a decelerated era to an accelerated one is usually achieved in modified gravity models (e.g., [4,43,44,45,46,47]), and the aim in this paper is to investigate if a viable late-time phenomenology can be achieved for f ( R, T ) models of gravity in the presence of collisional matter
In this paper we considered the late-time evolution of f ( R, T ) gravity models, with the dark matter component of the theory being collisional
Summary
Recent observations of the accelerated cosmic expansion [1,2] coming from Type Ia supernovae, and the confirmation of the B-mode power spectrum during the early-time inflationary era [3], have utterly changed the perspective of theoretical cosmologists with regard to the evolution of the Universe.The main aim and challenge is to find a unified description of the early and late-time eras, within the same theoretical framework. In this paper we use the f ( R, T ) gravity framework to study the late-time evolution of several cosmological models, in the presence of a collisional matter fluid.
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