A complete cosmological scenario from f(R,T^{φ }) gravity theory
Abstract
Recent elaborated by Harko et al., the f( R, T) theories of gravity allow one to contemplate an optimistic alternative to dark energy, for which R and T stand for the Ricci scalar and the trace of the energy-momentum tensor, respectively. Although the literature has shown that the T dependence on the gravitational part of the action - which is due to the consideration of quantum effects - may induce some novel features in the scope of late-time cosmological dynamics, in the radiation-dominated universe, when T=0, no contributions seem to arise from such theories. Apparently, f( R, T) contributions to a radiation-dominated universe may arise only from the f(R,T^{φ }) approach, which is nothing but the f( R, T) gravity in the case of a self-interacting scalar field whose trace of the energy-momentum tensor is T^{φ }. We intend, in this article, to show how f(R,T^{φ }) theories of gravity can contribute to the study of the primordial stages of the universe. Our results predict a graceful exit from an inflationary stage to a radiation-dominated era. They also predict a late-time cosmic acceleration after a matter-dominated phase, enabling the f(R,T^{φ }) theories to describe, in a self-consistent way, all the different stages of the dynamics of the universe.
- Publication:
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European Physical Journal C
- Pub Date:
- February 2016
- DOI:
- 10.1140/epjc/s10052-016-3912-4
- arXiv:
- arXiv:1601.02811
- Bibcode:
- 2016EPJC...76...60M
- Keywords:
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- General Relativity and Quantum Cosmology
- E-Print:
- 10 pages, 6 figures