Bulk viscous fluid hypersurface–homogeneous cosmological models with time varying G and Λ

Ram, Shri; Verma, Manoj Kumar

doi:10.1007/s10509-010-0370-6

Astrophys Space Sci

2010

DOI: 10.1007/s10509-010-0370-6

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Bulk viscous fluid hypersurface–homogeneous cosmological models with time varying G and Λ

Shri Ram

Manoj Kumar Verma

Abstract: Hypersurface-homogeneous cosmological models containing a bulk viscous fluid with time varying G and have been presented. We have shown that the field equations are solvable for any arbitrary cosmic scale function. The viscosity coefficient of bulk viscous fluid is assumed to be a power function of the energy density. Exact solutions of Einstein's field equations are obtained which represent an expanding, shearing and accelerating/decelerating models of the universe. The physical and kinematical behaviours of … Show more

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Cited by 16 publications

(1 citation statement)

References 45 publications

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“…Barrow et al [22] presented a detailed analysis of FRW universe in a wide range of scalar-tensor theories of gravitation. Shri et al [23] investigated hypersurfacehomogeneous bulk viscous fluid cosmological models with time-varying 𝐺 and Λ.…”

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confidence: 99%

Anisotropic Plane Symmetric Two-Fluid Cosmological Model with Time-Varying G and Λ

Verma¹,

Chandel

Ram

2015

Chinese Phys. Lett.

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We investigate a two-fluid anisotropic plane symmetric cosmological model with variable gravitational constant 𝐺(𝑡) and cosmological term Λ(𝑡). In the two-fluid model, one fluid is chosen to be that of the radiation field modeling the cosmic microwave background and the other one a perfect fluid modeling the material content of the universe. Exact solutions of the field equations are obtained by using a special form for the average scale factor which corresponds to a specific time-varying deceleration parameter. The model obtained presents a cosmological scenario which describes an early acceleration and late-time deceleration. The gravitation constant increases with the cosmic time whereas the cosmological term decreases and asymptotically tends to zero. The physical and kinematical behaviors of the associated fluid parameters are discussed.

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mentioning

confidence: 99%

Anisotropic Plane Symmetric Two-Fluid Cosmological Model with Time-Varying G and Λ

Verma¹,

Chandel

Ram

2015

Chinese Phys. Lett.

Self Cite

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Anisotropic cosmological model with variable G and Λ

Tripathy

Behera²,

Routray

2012

Astrophys Space Sci

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Anisotropic Bianchi-III cosmological model is investigated with variable gravitational and cosmological constants in the framework of Einstein's general relativity. The shear scalar is considered to be proportional to the expansion scalar. The dynamics of the anisotropic universe with variable ‫ܩ‬ and Λ are discussed. Without assuming any specific forms for Λ and the metric potentials, we have tried to extract the time variation of ‫ܩ‬ and Λ from the anisotropic model. The extracted ‫ܩ‬ and Λ are in conformity with the present day observations. Basing upon the observational limits, the behavior and range of the effective equation of state parameter are discussed.

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Bianchi type V viscous fluid cosmological models in presence of decaying vacuum energy

Bali

Singh

2012

Astrophys Space Sci

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Bianchi type V viscous fluid cosmological model for barotropic fluid distribution with varying cosmological term Λ is investigated. We have examined a cosmological scenario proposing a variation law for Hubble parameter H in the background of homogeneous, anisotropic Bianchi type V space-time. The model isotropizes asymptotically and the presence of shear viscosity accelerates the isotropization. The model describes a unified expansion history of the universe indicating initial decelerating expansion and late time accelerating phase. Cosmological consequences of the model are also discussed.

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Bulk viscous fluid hypersurface–homogeneous cosmological models with time varying G and Λ

Cited by 16 publications

References 45 publications

Anisotropic Plane Symmetric Two-Fluid Cosmological Model with Time-Varying G and Λ

Anisotropic Plane Symmetric Two-Fluid Cosmological Model with Time-Varying G and Λ

Anisotropic cosmological model with variable G and Λ

Bianchi type V viscous fluid cosmological models in presence of decaying vacuum energy

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