Generalized Ghost Dark Energy Model in the Framework of Quantum Cosmology for Different Scale Factor Choices

2018 ◽  
Vol 6 (2) ◽  
pp. 7-14
Author(s):  
Ayman A. Aly
Keyword(s):  
Dark Energy ◽  
Quantum Cosmology ◽  
Dark Energy Model ◽  
Scale Factor ◽  
Energy Model ◽  
Ghost Dark Energy ◽  
Generalized Ghost Dark Energy

Cosmic evolution of ghost dark energy models in f(G,T) gravity

2019 ◽  
Vol 35 (10) ◽  
pp. 2050063
Author(s):  
M. Sharif ◽  
Saadia Saba
Keyword(s):  
Dark Energy ◽  
Equation Of State ◽  
Speed Of Sound ◽  
Dark Energy Model ◽  
State Parameter ◽  
Energy Model ◽  
Frw Universe ◽  
Ghost Dark Energy ◽  
Energy Models ◽  
Generalized Ghost Dark Energy

The aim of this paper is to study the reconstruction paradigm for both ghost as well as generalized ghost dark energy models in the context of [Formula: see text] gravity. To accomplish this, we use correspondence scenario for pressureless flat FRW universe with power-law scale factor. The cosmological behavior of reconstructed models is analyzed through graphical analysis of deceleration, equation of state, squared speed of sound parameters and phase planes. It is found that the deceleration parameter represents accelerated epoch for both models whereas equation of state parameter indicates phantom era of the universe for ghost dark energy model and quintessence for its generalized version. The phase planes [Formula: see text] and [Formula: see text] indicate the freezing region with phantom phase for both reconstructed dark energy models. We conclude that the squared speed of sound parameter leads to the stability of generalized ghost dark energy model only.

scholarly journals Generalized ghost dark energy in Brans–Dicke theory

2013 ◽  
Vol 91 (8) ◽  
pp. 662-667 ◽  
Author(s):  
A. Sheykhi ◽  
E. Ebrahimi ◽  
Y. Yousefi
Keyword(s):  
Dark Energy ◽  
Equation Of State ◽  
Dark Energy Model ◽  
Vacuum Energy ◽  
State Parameter ◽  
Energy Model ◽  
Time Dependent ◽  
Ghost Dark Energy ◽  
Ghost Field ◽  
Generalized Ghost Dark Energy

It was argued that the vacuum energy of the Veneziano ghost field of QCD, in a time-dependent background, can be written in the general form, H + O(H2), where H is the Hubble parameter. Based on this, a phenomenological dark energy model whose energy density is of the form ρ = αH + βH2 was recently proposed to explain the dark energy dominated universe. In this paper, we investigate this generalized ghost dark energy model in the setup of Brans–Dicke cosmology. We study the cosmological implications of this model. In particular, we obtain the equation of state, the deceleration parameters, and a differential equation governing the evolution of this dark energy model. It is shown that the equation of state parameter of the generalized ghost dark energy can cross the phantom line (wD = −1) in some range of the parameters spaces.

scholarly journals Kinetic k-essence ghost dark energy model

2012 ◽  
Vol 709 (4-5) ◽  
pp. 313-321 ◽  
Author(s):  
Alberto Rozas-Fernández
Keyword(s):  
Dark Energy ◽  
Dark Energy Model ◽  
Energy Model ◽  
Ghost Dark Energy

scholarly journals Quintessence ghost dark energy model

2011 ◽  
Vol 95 (3) ◽  
pp. 39001 ◽  
Author(s):  
A. Sheykhi ◽  
A. Bagheri
Keyword(s):  
Dark Energy ◽  
Dark Energy Model ◽  
Energy Model ◽  
Ghost Dark Energy
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