Ghost dark energy in $f(R)$ model of gravity

Details Ghost dark energy in $f(R)$ model of gravity Ghost dark energy in $f(R)$ model of gravity

2012-03-17

arxiv.org/abs/1203.4518v1

Physics

General Physics

17page and 8figures

Scientific paper

We study a correspondence between $f(R)$ model of gravity and a phenomenological kind of dark energy (DE), which is known as QCD ghost dark energy. Since this kind of dark energy is not stable in the context of Einsteinian theory of gravity and Brans-Dicke model of gravity, we consider two kinds of correspondence between modified gravity and DE. By studding the dynamical evolution of model and finding relevant quantities such as, equation of state parameter, deceleration parameter, dimensionless density parameter, we show that the model can describe the present Universe and also the EoS parameter can cross the phantom divide line without needs to any kinetic energy with negative sign. Furthermore, by obtaining the adiabatic squared sound speed of the model for different cases of interaction, we show that this model is stable.

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