Note on the equation of state of geometric dark-energy in f(R) gravity

Abstract

We focus on the analysis of three inequivalent equations of state of geometric dark energy in $f(R)$ cosmology that have been considered in the past and discuss their differences, advantages and drawbacks.

Submited to Phys. Rev. D

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• A single parameterization for dark energy and modified gravity models
• Late-time and Big Bang nucleosynthesis constraints for generic modify gravity surveys
• Scalar perturbations in cosmological $f(R)$ models: the cosmic screening approach
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• Dynamics of pairwise motions in the fully non-linear regime in LCDM and Modified Gravity cosmologies
• Solar system tests and neutron stars in $f(R)$ gravity revisited
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• Cosmic acceleration in asymptotically Ricci flat Universe
• Globally Stable Dark Energy in $F(R)$ Gravity