Modified f(R) gravity from scalar-tensor theory and inhomogeneous EoS dark energy

Abstract

The reconstruction of f(R)-gravity is showed by using an auxiliary scalar field in the context of cosmological evolution, this development provide a way of reconstruct the form of the function f (R) for a given evolution of the Hubble parameter. In analogy, f(R)-gravity may be expressed by a perfect fluid with an inhomogeneous equation of state that depends on the Hubble parameter and its derivatives. This mathematical equivalence that may confuse about the origin of the mechanism that produces the current acceleration, and possibly the whole evolution of the Hubble parameter, is shown here.

8 pages

References in corpus (9)

• Disappearing cosmological constant in f(R) gravity
• Class of viable modified $f(R)$ gravities describing inflation and the onset of accelerated expansion
• Conditions for the cosmological viability of f(R) dark energy models
• Modified f(R) gravity unifying R^m inflation with \LambdaCDM epoch
• Phantom scalar dark energy as modified gravity: understanding the origin of the Big Rip singularity
• Reconstructing the universe history, from inflation to acceleration, with phantom and canonical scalar fields
• A FRW Dark Fluid with a Non-Linear Inhomogeneous Equation of State
• Dark Energy Fluid with Time-Dependent, Inhomogeneous Equation of State
• Direct Reconstruction of the Dark Energy Scalar-Field Potential