In this study, we examine two models of the scalar field, that is, a normal scalar field and a tachyon scalar field in F(R, T, X, phi) gravity to describe cosmic acceleration of the universe, where R, T and X are Ricci ...

In this study, we show the early inflation and the late-time acceleration of the universe in the model R + alpha R-n - beta R2-n + f(X, phi), which shows a minimum connection between geometry and scalar field. Both a ...

The phantom behavior of the Universe is discussed in an extended version of Gauss-Bonnet gravity. Following the method proposed by the author (Int. J. Mod. Phys. D, 27, 1850078. 2018. doi:10.1142/S0218271818500785), we ...

In this study, we discuss coexistence of the early-time inflation and the late-time acceleration of the universe in the context of the theory of F(G, T) gravity with scalar field which is minimally coupled with the gravity, ...

There are various mechanisms that explain both the inflationary epoch of the early universe and a unification of this epoch with the other stages of the universe. In this study, we show all the expansion history of the ...

Viability of the super inflation scenario is discussed in F(T) modified teleparallel gravity. We calculate the power spectrum of the primordial curvature and tensor perturbations, and we derive two important parameters ...

In this study, we realize a unified solution of F(R, T-2) gravity in the context of the spatially flat Friedmann-Robertson-Walker universe, where R is the Ricci curvature scalar and T-2 = T mu nu T mu nu is the scalar ...

Various approaches are developed that provide a unification of the early inflationary epoch of the universe and dark energy (cosmic accelerating expansion case). In one respect, we express this unification in a universal ...

In this paper, we discuss possible three early eras of the universe in the theoretical context of the Galilean cosmology. The first phase is a slow-roll inflation phase in which the friction term in the equations of motion ...

In this work, we study on the inflationary era of the Universe in the context of f(R) gravity. For this purpose, we consider the f(R) gravity and its scalar perturbation equations. We start with an equation symmetry approach, ...