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 ...

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 ...

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 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, ...

In this study, making use of the f(R) theory of gravity in a D-dimensional Kaluza-Klein type framework, we discuss whether we need to assume additional dimensions in order to explain two stages (inflation and deceleration ...

In this study, the validity of the generalized second law of thermodynamics (GSLT) has been investigated in F(R, G) gravity. We consider that the boundary of the universe is surrounded by an apparent horizon in the spatially ...

In this work, we focus on the dynamics of Dirac particles in the presence of a constant electric field in a cosmological anisotropic universe. Instead of Einstein's theory of general relativity, we perform the calculations ...