The classical generalization of general relativity is considered as the gravitational alternative
for a unified description of the early-time inflation with late-time cosmic acceleration. The …

Alternative cosmologies, based on extensions of General Relativity, predict modified thermal
histories in the early universe during the pre Big Bang Nucleosynthesis (BBN) era. When the …

We study a correspondence between f (R) model of gravity in the Jordan frame and a
phenomenological kind of dark energy (DE), which is known as QCD ghost DE. Since this …

The perihelion precession, the deflection of light and the radar echo delay are classical tests
of General Relativity here used to probe brane-world topologically charged black holes in af …

We investigate the corresponding relation between f (R) gravity and holographic dark
energy. We introduce a type of energy density from f (R) that has the same role as …

We study the f (R) theory of gravity in an anisotropic metric and its effect on the baryon
number-to-entropy ratio. The mechanism of gravitational baryogenesis based on the CPT …

We introduce a new approach for investigating the weak field limit of vacuum field equations
in f (R) gravity and we find the weak field limit of f (R)= R+ μ 4/R gravity. Furthermore, we …

In this paper, we study the properties of the Holographic Dark Energy (HDE) model in the
context of Kaluza-Klein (KK) cosmology with infrared cut-off given by the recently proposed …

In this paper we work out collapsing conditions for a spherical star in the weak field limit of
the R+μ^4/R R+ μ 4/R gravity and discuss the importance of the parameter μ to generate …

A ghost dark energy model has been recently put forward to explain the current accelerated
expansion of the universe. In this model, we develop the general scheme for modified f (R) …