Viscous generalized Chaplygin gas as a unified dark fluid

Wei, Li; Xu, Lixin

doi:10.1140/epjc/s10052-013-2471-1

Cited by 22 publications

(59 citation statements)

References 26 publications

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“…This fact promoted the development of numerous alternatives explaining anomalies in the movement of stars and galaxies, e.g. [1,2,[7][8][9][10][11][12][13][14]17,18]. It is noteworthy that our approach based on additional summand proportional to 1/R to the classic gravity force proportional to 1/R 2 was first suggested in 1983-1984 [18].…”

Section: Discussionmentioning

confidence: 99%

“…The first one was proposed by Milgrom in 1983. Modified Newtonian Dynamics (MOND) [7], then Tensor-Vector-Scalar Gravity (TeVeS) [8], Nonsymmetric Gravitational Theory (NGT) [9,10], "dark fluid", Chaplygin gas [11], double metric tensor [12], introduction of the 7D space-time metric [13], reduction of the space dimension [2] and so on.…”

Section: Hypotheses Proposed To Explain the Motion Of The Matter At Smentioning

confidence: 99%

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An Addition to the Classic Gravity Interstellar Interactions

Pa¹,

Sp²

2017

J Astrophys Aerospace Technol

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Section: Discussionmentioning

confidence: 99%

Section: Hypotheses Proposed To Explain the Motion Of The Matter At Smentioning

confidence: 99%

An Addition to the Classic Gravity Interstellar Interactions

Pa¹,

Sp²

2017

J Astrophys Aerospace Technol

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“…The MGCG is more appropriate choice to have constant negative pressure at low energy density and high pressure at high density. The viscous CG model is the suitable candidate of unified DE and cold DM as a unique imperfect fluid [9,10]. It has bulk viscosity with negative pressure suggested by observations [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…The viscous CG model is the suitable candidate of unified DE and cold DM as a unique imperfect fluid [9,10]. It has bulk viscosity with negative pressure suggested by observations [9,10]. The Generalized Cosmic Chaplygin Gas (GCCG) is another form of DE having the consequence of an accelerating phase of universe, which was introduced by Gonzalez-Diaz [11].…”

Section: Introductionmentioning

confidence: 99%

Viscous Chaplygin gas models as spherical top-hat collapsing fluids

Jawad

Iqbal

2016

Int. J. Mod. Phys. D

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We study the spherical top-hat collapse in Einstein gravity and loop quantum cosmology by taking the non-linear evolution of viscous modified variable chaplygin gas and viscous generalized cosmic chaplygin gas. We calculate the equation of state parameter, square speed of sound, perturbed equation of state parameter, perturbed square speed of sound, density contrast and divergence of peculiar velocity in perturbed region and discussed their behavior. It is observed that both chaplygin gas models support the spherical collapse in Einstein as well as loop quantum cosmology because density contrast remains positive in both cases and the perturbed equation of state parameter remains positive at the present epoch as well as near future. It is remarked here that these parameters provide the consistence results for both chaplygin gas models in both gravities.

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“…2. Alternative approaches to correct the situation include a number of methods aimed at modifications of Newton's dynamics (MOND (Modified Newtonian Dynamics) [6], TeVeS (Tensor-Vector-Scalar Gravity) [7], NGT (Nonsymmetric Gravitational Theory) [8], "dark fluid" (Chaplygin gas) [9], double metric tensor [10], etc.). However, these approaches are rather complicated and allow one to explain only the constancy of the velocities of star rotation at the periphery of galaxies.…”

Section: Introductionmentioning

confidence: 99%

A Change of the Gravitational Interaction on the Galactic Distances

SP¹

2015

Astrobiol Outreach

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In order to explain anomalous velocities of star rotation in galaxies, some researchers propose corrections to Newton's dynamics. In contrast to this opinion, we suppose that it is possible to correct the potential of gravity interaction. The modulus of the force of interaction between the bodies may be written as: F=Exp (-R 2 /α)γMm/R 2 + (1 -Exp(-R 2 /α))δMm/R, где α ~ 4×10 5 (au) -2 , δ ~ 2.7×10 -31 N m kg -2 . This correction allows one to conserve the force of attraction between the bodies within the Solar System proportional to 1/R 2 , while for longer interstellar distances it will be proportional to 1/R. It provides a good description both for the motion of planets in the Solar System and for the motions of stars and galaxies. Within the framework of the proposed approach, there is no necessity to introduce the idea of dark matter. According to the analysis of the proposed interaction with the help of the virial theorem, it does not contradict basic notions on the motion of stars and planets; in particular, it does not contradict the established accelerated expansion of the Universe.

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Viscous generalized Chaplygin gas as a unified dark fluid

Cited by 22 publications

References 26 publications

An Addition to the Classic Gravity Interstellar Interactions

An Addition to the Classic Gravity Interstellar Interactions

Viscous Chaplygin gas models as spherical top-hat collapsing fluids

A Change of the Gravitational Interaction on the Galactic Distances

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