Interacting generalized ghost dark energy in a non-flat universe

Ebrahimi, Esmaeil; Sheykhi, Ahmad; Alavirad, Hamzeh

doi:10.2478/s11534-013-0253-x

Cited by 12 publications

(15 citation statements)

References 83 publications

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“…To address the problem of accounting for the accelerated expansion of the universe and due to an absence of knowledge in this domain, theoretical cosmologists have considered a variety of dark matter candidates to explain this phenomenon. The ghost dark matter (GDE) model which was proposed by Urban and Zhitnitsky [33][34][35][36] as well as N. Ohta [37] has been studied in several papers [44,48,49]. Without introducing further unknown degrees of freedom, this model predicts cosmic expansion based on dark energy with a correct magnitude.…”

Section: Summary and Discussionmentioning

confidence: 99%

Interacting ghost dark energy in complex quintessence theory

Liu¹

2020

Eur. Phys. J. C

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We employ a ghost model of interacting dark energy to obtain the equation of state $$\omega $$ ω for ghost energy density in an FRW universe in complex quintessence theory. We reconstruct the potential and study the dynamics of the scalar field that describes complex quintessence cosmology. We perform $$\omega -\omega '$$ ω - ω ′ analysis and stability analysis for both non-interacting and interacting cases and find that the same basic conclusion as for the real model, where $$\omega ' = d\omega / d ln a$$ ω ′ = d ω / d l n a . Taking account of the effect of the complex part and assuming the real part of the quintessence field to be a slow-rolling field, we conclude that the non-interacting model cannot describe the real universe since this will lead to fractional energy density $$\Omega _D > 1$$ Ω D > 1 , where $$\Omega _D$$ Ω D can be defined as the ratio of $$\rho _D$$ ρ D to $$\rho _{cr}$$ ρ cr . However, for the interacting case, if we take present $$\Omega _D =0.73$$ Ω D = 0.73 , then we can determine that $$b^2 = 0.0849$$ b 2 = 0.0849 , where $$b^2$$ b 2 is the interaction coupling parameter between matter and dark energy. In the real quintessence model, $$\Omega _D$$ Ω D and $$b^2$$ b 2 are independent parameters, whereas in the complex quintessence model, we conclude that there is a relationship between these two parameters.

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Section: Summary and Discussionmentioning

confidence: 99%

Interacting ghost dark energy in complex quintessence theory

Liu¹

2020

Eur. Phys. J. C

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“…Upto now, this model was investigated by different cosmological parameters such as EoS parameter, deceleration, ω −ω , statefinder and squared speed of sound etc. [26,[43][44][45][46]. Its generalized version in terms of PDE is defined as follows [26] …”

Section: Non-flat Frw Universe and Basic Equationsmentioning

confidence: 99%

Analysis of generalized ghost pilgrim dark energy in non-flat FRW universe

Jawad

2014

Eur. Phys. J. C

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This work is based on pilgrim dark energy conjecture which states that phantom-like dark energy possesses the enough resistive force to preclude the formation of black hole. The non-flat geometry is considered which contains the interacting generalized ghost pilgrim dark energy with cold dark matter. Some well-known cosmological parameters (evolution parameter (ω ) and squared speed of sound) and planes (ω -ω and statefinder) are constructed in this scenario. The discussion of these parameters is totally done through pilgrim dark energy parameter (u) and interacting parameter (d 2 ). It is interesting to mention here that the analysis of evolution parameter supports the conjecture of pilgrim dark energy. Also, this model remains stable against small perturbation in most of the cases of u and d 2 . Further, the cosmological planes correspond to CDM limit as well as different well-known dark energy models.

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“…Combining relations ( 7) and ( 8) with continuity equation ( 3), and solving the resulting equation for w D , we find where ξ = 8πGβ/3. When △ G = 0, we obtain the equation of state parameter of GGDE [31],…”

Section: Ggde Model With Varying Gravitational Constantmentioning

confidence: 99%

“…It was also shown that considering this term leads to a better agreement with observational data [29]. The GDE with sub-leading term H 2 is usually called generalized ghost dark energy (GGDE) and various aspects of it has been investigated in the literature [30,31].…”

Section: Introductionmentioning

confidence: 99%

Generalized Ghost Dark Energy Model with Varying G

Yousefi¹,

Sheykhi

2013

ujpa

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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, ξ = 0.01 and assuming Ω 0 D = 0.73 for the present time, we find −0.80 < w 0 D ≤ −0.78 and −0.41 < q 0 ≤ −0.36 for the present ranges of the equation of state and the deceleration parameters. This values are consistent with the recent observations.

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Interacting generalized ghost dark energy in a non-flat universe

Cited by 12 publications

References 83 publications

Interacting ghost dark energy in complex quintessence theory

Interacting ghost dark energy in complex quintessence theory

Analysis of generalized ghost pilgrim dark energy in non-flat FRW universe

Generalized Ghost Dark Energy Model with Varying G

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