1202.4097 (Khaled Saaidi)

Stability of Ghost Dark Energy in CBD Model of Gravity    [PDF]

Khaled Saaidi

We study the stability of the ghost dark energy model versus perturbation.
Since this kind of dark energy is instable in Einsteinian general relativity
theory, then we study a new type of Brans-Dicke theory which has non-minimal
coupling with matter which is called chameleon Brans-Dicke (CBD) model of
gravity. Due to this coupling the equation of conservation energy is modified.
For considering the stability of the model we use the adiabatic squared sound
speed, $c_s^2$, whose sign of it determines the stability of the model in which
for $c_s^2 >0 $ the model is stable and for $c_s^2 <0 $ the model is instable.
However, we study the interacting and non-interacting version of chameleon
Brans-Dicke ghost dark energy (CBDGDE) with cold dark matter in non flat FLRW
metric. We show that in all cases of investigation the model is stable with a
suitable choice of parameters.

View original: http://arxiv.org/abs/1202.4097