FRW Cosmology and Static Extra Dimension with Non-zero Cosmological Constant

Amani, Alireza; Pourhassan, B.

doi:10.1007/s10773-011-0876-x

Cited by 7 publications

(6 citation statements)

References 13 publications

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“…Another interesting model of dark energy, which is introduced recently, called Veneziano ghost dark (GD) energy, which supposed to exist to solve the U(1) problem in low-energy effective theory of QCD, and has attracted a lot of interests in recent years [43][44][45][46][47][48]. On the other hand, higher dimensional space-time introduced in the several physical theories to obtain unified theory [49]. In this paper, we consider a two-component fluid [50] with extra dimension as a candidate of universe.…”

Section: Introductionmentioning

confidence: 99%

Interaction between modified Chaplygin gas and ghost dark energy in the presence of extra dimensions

et al. 2014

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In this paper, we consider three different models of dark energy in higher dimensional space-time and discuss about some cosmological parameters numerically. The first model is a single component universe including viscous varying modified Chaplygin gas. In the second model, we consider two-component universe including viscous varying modified Chaplygin gas and ghost dark energy. In the third model, we consider another two-component universe including viscous modified cosmic Chaplygin gas and ghost dark energy. In the cases of two-component fluids we also consider possibility of interaction between components.

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Section: Introductionmentioning

confidence: 99%

Interaction between modified Chaplygin gas and ghost dark energy in the presence of extra dimensions

et al. 2014

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“…Subsequently, we related the obtained energy density of matter to Friedmann equations of gravity with a specified function of Eq. (38), which is exponential and logarithmic. In this case, we obtained the energy density (39) and pressure (40) of dark energy in terms of the number of particles N. Then, we reconstructed the number of particles in terms of the redshift parameter; the benefit of this reconstruction is that the cosmological parameters can be evaluated for late time (…”

Section: Q)mentioning

confidence: 99%

Observational Hubble parameter data constraints on the interactive model of gravity with particle creation

Ganjizadeh¹,

Amani²,

Ramzanpour³

2022

Chinese Phys. C

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In this paper, we consider an open system from the thermodynamic perspective for an adiabatic FRW universe model in which particle creation occurs within the system. In that case, the modified continuity equation is obtained and then we correspond it to the continuity equation of $f(T)$ gravity. So, we take $f(T)$ gravity with the viscous fluid in flat-FRW metric, in which $T$ is the torsion scalar. We consider the contents of the universe to be dark matter and dark energy and consider an interaction term between them. The interesting point of this study is that we make equivalent the modified continuity equation resulting from the particle creation with the matter continuity equation resulting from $f(T)$ gravity. The result of this evaluation creates a relationship between the number of particles and the scale factor. In what follows, we write the corresponding cosmological parameters in terms of the number of particles and also reconstruct the number of particles in terms of the redshift parameter, then We parameterize the Hubble parameter derived from power-law cosmology with 51 data from the Hubble observational parameter. Next, we plot the corresponding cosmological parameters for the dark energy in terms of the redshift to investigate the accelerated expansion of the universe. In addition, by using the sound speed parameter, we discuss the stability analysis and instability analysis of the present model in different eras of the universe. Finally, we plot the density parameter values for dark energy and dark matter in terms of the redshift parameter.

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“…In the Ref. [50] a five dimensional FRW cosmology with static extra dimension considered and field equations including cosmological constant obtained.…”

Section: Introductionmentioning

confidence: 99%

“…In the recent work we considered interacting Ghost dark energy models with variable G and Λ [48]. Now, we would like to extend this work to the case including extra dimensions [49,50,51]. Extra dimensions introduced some times to obtain unified theory, for example in the Kaluza-Klein theory to explain the unification of fundamental force with gravity.…”

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confidence: 99%

Interacting ghost dark energy models in the higher dimensional cosmology

Sadeghi

Khurshudyan

Farahani

2016

Int. J. Mod. Phys. D

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We investigate interacting ghost dark energy models in higher dimensional cosmology. We attempt to model dark matter within a barotropic fluid with P b = ω(t) b ρ. In this work we consider four different models based on choosing equation of state parameter and interaction term. We confirm that our models agree with observational data. cosmological constant introduced by Einstein. This model has fine-tuning and coincidence problems. Absence of a fundamental mechanism which sets the cosmological constant zero or very small value makes researchers to go deeper and deeper in theories to understand the solution of these problems. In order to alleviate these problems alternative models of dark energy suggest a dynamical form of dark energy, which at least in an effective level, can originate from a variable cosmological constant [6,7], or from various fields, such as a quintessence [8][9][10], a phantom field [11][12][13][14][15], or the combination of quintessence and phantom in a unified model named quintom [16][17][18][19][20]. By using some basic of quantum gravitational principles one can formulate several other models for dark energy, and in literature they are known as holographic dark energy models [21][22][23][24][25] and agegraphic dark energy models [26][27][28]. Interaction between components is proved to be other way which can solve coincidence problem. From observations no piece of evidence has been so far presented against interactions between dark energy and dark matter. From theoretical side we have not any known symmetry which prevents or suppresses a non-minimal coupling between dark energy and dark matter. Research in theoretical cosmology proposes two possible ways to explain later time accelerated expansion of the Universe. Remember that field equations make connection between geometry and matter content of Universe in a simple way. Therefore, there is two possibilities either we should modify matter content which is coded in energy-stress tensor or we should modify geometrical part including different functions of Ricci scalar etc. Different type of couplings between geometry and matter could give desirable effects as well. Recently, several authors try to make connection between scalar field and other models of dark energy. In literature, often used idea of fluid despite to other ideas, because over the years we learned that modifications of geometrical part of field equations can be codded in fluid expression. Chaplygin gas and its extensions [29][30][31][32][33][34][35][36][37][38][39][40] are interesting models based of the above idea. This model is more appropriate choice to have constant negative pressure at low energy density and high pressure at high energy density. Among various models of dark energy, a new model is called Veneziano ghost dark energy, has attracted a lot of interests in recent years [41][42][43][44][45][46][47]. Indeed, the contribution of the ghosts field to the vacuum energy in curved space or time-dependent backgrounds can regarded as a possible candidate for the dark...

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FRW Cosmology and Static Extra Dimension with Non-zero Cosmological Constant

Cited by 7 publications

References 13 publications

Interaction between modified Chaplygin gas and ghost dark energy in the presence of extra dimensions

Interaction between modified Chaplygin gas and ghost dark energy in the presence of extra dimensions

Observational Hubble parameter data constraints on the interactive model of gravity with particle creation

Interacting ghost dark energy models in the higher dimensional cosmology

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