Stability of Ghost Dark Energy in CBD Model of Gravity

Saaidi, Kh.

doi:10.48550/arxiv.1202.4097

Cited by 2 publications

(2 citation statements)

References 23 publications

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“…Indeed, the negativity of it shows a sign of instability in the model. The behavior of the squared sound speed for HDE [48], agegraphic DE [49] and the ghost DE model [50,51] were investigated. It was found that all these models [48][49][50][51] are instable against background perturbations and so cannot lead to a stable DE dominated universe.…”

Section: Stability Of the Modelmentioning

confidence: 99%

Holographic dark energy in the DGP braneworld with Granda-Oliveros cutoff

2014

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We consider the holographic dark energy (HDE) model in the framework of DGP braneworld with Granda-Oliveros infrared (IR) cutoff, L = (αḢ + βH 2 ) −1/2 . With this choice for IR cutoff, we are able to derive evolution of the cosmological parameters such as the equation of state and the deceleration parameters, w and q, as the functions of the redshift parameter z. As far as we know, most previous models of HDE presented in the literatures, do not gives analytically ω = ω(z) and q = q(z). We plot the evolution of these parameters versus z and discuss that the results are compatible with the recent observations. With suitably choosing the parameters, this model can exhibit a transition from deceleration to the acceleration around z ≈ 0.6. Then, we suggest a correspondence between the quintessence and tachyon scalar fields and HDE in the framework of DGP braneworld. This correspondence allows us to reconstruct the evolution of the scalar fields and the scalar potentials. We also investigate stability of the presented model by calculating the squared sound speed, v 2 s , whose sign determines the stability of the model. Our study shows that v 2 s could be positive provided the parameters of the model are chosen suitably. In particular, for α > 1, β > 0, and α < 1, β < 0, we have v 2 s > 0 during the history of the universe, and so the stable dark energy dominated universe can be achieved. This is in contrast to the HDE in standard cosmology, which is unstable against background perturbations and so cannot lead to a stable dark energy dominated universe.

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Section: Stability Of the Modelmentioning

confidence: 99%

Holographic dark energy in the DGP braneworld with Granda-Oliveros cutoff

2014

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“…where α is a constant with dimension [energy] 3 , and roughly of order of Λ 3 QCD . This new kind of DE model has got a lot of enthusiasm recently in the literature [30,31,32,33,34,35,36,37,38,39,40]. Although the ordinary GDE model is consistent with the observational data, it suffers from the difficulty to describe the early evolution of the universe.…”

Section: Introductionmentioning

confidence: 99%

QCD Modified Ghost Scalar Field Dark Energy Models

Karami

Asadzadeh

Mousivand

et al. 2013

Int. J. Mod. Phys. D

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Within the framework of FRW cosmology, we study the QCD modified ghost scalar field models of dark energy in the presence of both interaction and viscosity. For a spatially non-flat FRW universe containing modified ghost dark energy (MGDE) and dark matter, we obtain the equation of state of MGDE, the deceleration parameter as well as a differential equation governing the MGDE density parameter. We also investigate the growth of structure formation for our model in a linear perturbation regime. Furthermore, we reconstruct both the dynamics and potentials of the quintessence, tachyon, K-essence and dilaton scalar field DE models according to the evolution of the MGDE density.PACS numbers: 98.80.−k, 95.36.+x

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Stability of Ghost Dark Energy in CBD Model of Gravity

Cited by 2 publications

References 23 publications

Holographic dark energy in the DGP braneworld with Granda-Oliveros cutoff

Holographic dark energy in the DGP braneworld with Granda-Oliveros cutoff

QCD Modified Ghost Scalar Field Dark Energy Models

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