Viscous Modified Cosmic Chaplygin Gas Cosmology

Pourhassan, B.

doi:10.1142/s0218271813500612

Cited by 128 publications

(84 citation statements)

References 63 publications

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“…This model is subject of some brane world scenario Ranjit et al 2013aRanjit et al , 2013b, and holographic model of dark energy (Farooq et al 2010;Paul 2010;Sadeghi et al 2014a). Viscous modified Chaplygin gas also introduced by Pun et al (2008) and completed by the recent works (Pourhassan 2013;Saadat and Pourhassan 2013b;Benaoum 2014). The MCG equation of state (EoS) has two parts, the first term gives an ordinary fluid obeying a linear barotropic EoS, and the second term relates pressure to some power of the inverse of energy density.…”

Section: Introductionmentioning

confidence: 99%

Observational constraints on the extended Chaplygin gas inflation

Kahya

Pourhassan

2014

Astrophys Space Sci

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In this paper, we study extended Chaplygin gas as a candidate for inflation and predict the values of gas parameters for a physically viable cosmological model. The extended Chaplygin gas which proposed recently has n + 2 free parameters. When n = 1, there are three parameters which are corresponding to modified Chaplygin gas. Here we focus on the second order equation of state where n = 2, so we have generally four free parameters. Under some assumptions, we reduced free parameters of the model to the only one parameter and try to fix it using the dimensionless age parameter. Also we check validity of our calculations using recent observations of BICEP2.

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Section: Introductionmentioning

confidence: 99%

Observational constraints on the extended Chaplygin gas inflation

Kahya

Pourhassan

2014

Astrophys Space Sci

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“…Recently, the generalized cosmic Chaplygin gas (GCCG) model also introduced [9,10], 4) in such a way that the resulting models can be made stable and free from unphysical behaviors even when the vacuum fluid satisfies the phantom energy condition [11]. It is then straightforward to construct modified cosmic Chaplygin gas [12][13][14],…”

Section: +007mentioning

confidence: 99%

Interacting holographic extended Chaplygin gas and phantom cosmology in the light of BICEP2

2015

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Abstract:In this paper, we study the holographic dark energy density and interacting extended Chaplygin gas energy density in the Einstein gravity. We reconstruct the scalar field and the scalar potential describing the extended Chaplygin gas. In the special case, we obtain energy density and investigate some cosmological parameters. Assuming interaction between components we find energy density for some different parametrization of total EoS. We analyze tensor to scalar ratio and use recent observational data of BICEP2 to fix the model parameters.

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“…• Exotic equation of state: a linear equation of state [8], van der Waals equation of state [9,10], Chaplygin gas [11][12][13], generalized Chaplygin gas [14,15], modified Chaplygin gas [16,17], superfluid Chaplygin gas [18][19][20], inhomogeneous equation of state [21], barotropic fluid model [22], Cardassian model [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Traversable geometric dark energy wormholes constrained by astrophysical observations

Wang

Meng

2016

Eur. Phys. J. C

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In this paper, we introduce the astrophysical observations into the wormhole research. We investigate the evolution behavior of the dark energy equation of state parameter ω by constraining the dark energy model, so that we can determine in which stage of the universe wormholes can exist by using the condition ω < −1. As a concrete instance, we study the Ricci dark energy (RDE) traversable wormholes constrained by astrophysical observations. Particularly, we find from Fig. 5 of this work, when the effective equation of state parameter ω X < −1 (or z < 0.109), i.e., the null energy condition (NEC) is violated clearly, the wormholes will exist (open). Subsequently, six specific solutions of statically and spherically symmetric traversable wormhole supported by the RDE fluids are obtained. Except for the case of a constant redshift function, where the solution is not only asymptotically flat but also traversable, the five remaining solutions are all non-asymptotically flat, therefore, the exotic matter from the RDE fluids is spatially distributed in the vicinity of the throat. Furthermore, we analyze the physical characteristics and properties of the RDE traversable wormholes. It is worth noting that, using the astrophysical observations, we obtain the constraints on the parameters of the RDE model, explore the types of exotic RDE fluids in different stages of the universe, limit the number of available models for wormhole research, reduce theoretically the number of the wormholes corresponding to different parameters for the RDE model, and provide a clearer picture for wormhole investigations from the new perspective of observational cosmology.a

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Viscous Modified Cosmic Chaplygin Gas Cosmology

Cited by 128 publications

References 63 publications

Observational constraints on the extended Chaplygin gas inflation

Observational constraints on the extended Chaplygin gas inflation

Interacting holographic extended Chaplygin gas and phantom cosmology in the light of BICEP2

Traversable geometric dark energy wormholes constrained by astrophysical observations

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