Cosmological consequences of a Chaplygin gas dark energy

Dev, Abha; Alcaniz, J. S.; Jain, Deepak

doi:10.1103/physrevd.67.023515

Cited by 232 publications

(142 citation statements)

References 60 publications

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“…For some further early works on the Chaplygin gas cosmology, see [4][5][6][7][8][9][10][11]. The paper [12] tests the Chaplygin gas against gravitational lenses and age estimations. The generalised Chaplygin model has the nice property that the background cosmology is for α = 0 identical to the ΛCDM model.…”

Section: Introductionmentioning

confidence: 99%

On the concordance of cosmological data in the case of the generalized Chaplygin gas

Aurich¹,

Lustig²

2018

Astroparticle Physics

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The generalized Chaplygin gas cosmology provides a prime example for the class of unified dark matter models, which substitute the two dark components of the standard cosmological ΛCDM concordance model by a single dark component. The equation of state of the generalized Chaplygin gas is characterised by a parameter α such that the standard ΛCDM model is recovered in the case α = 0 with respect to the background dynamics and the cosmic microwave background (CMB) statistics. This allows to investigate the concordance of different cosmological data sets with respect to α. We compare the supernova data of the Supernova Cosmology Project, the data of the baryon oscillation spectroscopic survey (BOSS) of the third Sloan digital sky survey (SDSS-III) and the CMB data of the Planck 2015 data release. The importance of the BOSS Lyman α forest BAO measurements is investigated. It is found that these data sets possess a common overlap of the confidence domains only for Chaplygin gas cosmologies very close to the ΛCDM model.

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Section: Introductionmentioning

confidence: 99%

On the concordance of cosmological data in the case of the generalized Chaplygin gas

Aurich¹,

Lustig²

2018

Astroparticle Physics

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“…The symmetric part represents gravitation, while the antisymmetric part represents electromagnetism. 4 Moreover, the anti-symmetric part of the vertical field equations is gauge invariant. Finally, all physical objects involved are expressed in terms of the fundamental tensors of the EAP-space together with the nonlinear connection N defined on the space.…”

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

Teleparallel Lagrange geometry and a unified field theory

Wanas

Youssef

Sid-Ahmed

2010

Class. Quantum Grav.

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Abstract. In this paper, we construct a field theory unifying gravity and electromagnetism in the context of Extended Absolute Parallelism (EAP-) geometry. This geometry combines, within its structure, the geometric richness of the tangent bundle and the mathematical simplicity of Absolute Parallelism (AP-) geometry. The constructed field theory is a generalization of the Generalized Field Theory (GFT) formulated by Mikhail and Wanas. The theory obtained is purely geometric. The horizontal (resp. vertical) field equations are derived by applying the Euler-Lagrange equations to an appropriate horizontal (resp. vertical) scalar Lagrangian. The symmetric part of the resulting horizontal (resp. vertical) field equations gives rise to a generalized form of Einstein's field equations in which the horizontal (resp. vertical) energy-momentum tensor is purely geometric. The skew-symmetric part of the resulting horizontal (resp. vertical) field equations gives rise to a generalized form of Maxwell equations in which the electromagnetic field is purely geometric. Some interesting special cases, which reveal the role of the nonlinear connection in the obtained field equations, are examined. Finally, the condition under which our constructed field equations reduce to the GFT is explicitly established.

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“…An alternative candidate for the dark energy models is the Chaplygin gas which can be assumed as a possible unification of dark matter and dark energy. Models with Chaplygin gas were studied by (Dev et al 2003;Setare 2009). Many variations of the Chaplygin gas model have been proposed (Bento et al 2002;Guo and Zhang 2007;Abdussattar and Prajapati 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Models with Chaplygin gas were studied by (Dev et al 2003;Setare 2009). Many variations of the Chaplygin gas model have been proposed (Bento et al 2002;Guo and Zhang 2007;Abdussattar and Prajapati 2011). One of them is the modified Chaplygin gas (MCG) model which obeys the equation of state…”

Section: Introductionmentioning

confidence: 99%

Plane symmetric solutions to the Einstein’s field equations with dark energy

Shen

Zhao

2011

Astrophys Space Sci

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In this paper, we solve the Einstein's field equations for the space-time described by a special plane symmetric metric with dark energy, and the exact solutions which offer an alternative and complementary approach to study cosmological models are obtained. The dark energy is given by either the quintessence or the modified Chaplygin gas. We show the models are isotropic and analyze the expansion scalar and the deceleration parameter of the models.

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Cosmological consequences of a Chaplygin gas dark energy

Cited by 232 publications

References 60 publications

On the concordance of cosmological data in the case of the generalized Chaplygin gas

On the concordance of cosmological data in the case of the generalized Chaplygin gas

Teleparallel Lagrange geometry and a unified field theory

Plane symmetric solutions to the Einstein’s field equations with dark energy

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