Abstract
The cosmological implications of the generalized ghost dark energy model in the presence of varying gravitational constant is investigated. In particular, evolution of the cosmological parameters such as the equation of state and the deceleration parameters are studied. The investigation is also generalized to the more general case where there is a bulk viscosity in the cosmic fluids. It is shown that by taking 0 < △G ≤ 0:07, = 0:01 and assuming Ω 0 = 0:73 for the present time, we find −0:80 < w 0 ≤ −0:78 and −0:41 < q0 ≤ −0:36 for the present ranges of the equation of state and the deceleration parameters. This values are consistent with the recent observations.
Highlights
Nowadays there is an ample consensus on the observational side that our Universe is experiencing a phase of accelerated expansion likely driven by some unknown energy component usually dubbed “dark energy” [1]
The GDE with sub-leading term H2 is usually called generalized ghost dark energy (GGDE) and various aspects of it has been investigated in the literature [30, 31]
This is due to the fact that physical units are quite arbitrary, and each individual constant can be removed through a suitable choice of units
Summary
Nowadays there is an ample consensus on the observational side that our Universe is experiencing a phase of accelerated expansion likely driven by some unknown energy component usually dubbed “dark energy” [1]. Many theoretical candidates have been proposed as dark energy, among them, those which originate from fundamental theory such as quantum gravity, has arisen a lot of enthusiasm, recently Two examples of such models are holographic and agegraphic dark energy models [2, 3, 4, 5, 6, 7, 8]. The GDE with sub-leading term H2 is usually called generalized ghost dark energy (GGDE) and various aspects of it has been investigated in the literature [30, 31]. We would like to study the effects of the time varying gravitational constant in the Universe filled with GGDE and dark matter.
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