Bulk Viscosity and Particle Creation in Brans - Dicke Theory

Singh, G. P.; Беешам, Ароонкумар

doi:10.1071/ph98107

Cited by 43 publications

(24 citation statements)

References 2 publications

(4 reference statements)

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“…They found that the adiabatic creation of massive particles implies power-law inflation. Sudharsan and Johri (1994), Johri and Desikan (1996), Desikan (1997), Singh and Beesham (1999), and Singh et al (2002) have studied cosmological models with particle creation using Prigogine et al's hypothesis in general relativity and some of its modified theories. After the discovery of the accelerating universe, this model was reconsidered to explain it and got some unexpected results.…”

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confidence: 98%

Early universe cosmology with particle creation: kinematics tests

Singh

Беешам

2011

Astrophys Space Sci

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We study some properties of the early evolution of the universe with particle creation in the framework of the flat Friedmann-Robertson-Walker line element. The field equations are solved by using "gamma-law" equation of state p = (γ − 1)ρ, where the parameter γ varies with cosmological time. A unified description of the early evolution of the universe is presented in which an inflationary phase is followed by a radiation-dominated phase. Exact expressions for the lookback time, proper distance, luminosity distance and angular diameter distance versus redshift are derived and their meaning discussed in detail. It is found that the negative pressure due to the particle creation may play the role of an accelerating universe.

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confidence: 98%

Early universe cosmology with particle creation: kinematics tests

Singh

Беешам

2011

Astrophys Space Sci

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“…Following Luis (1985), Johari and Kalyani (1994), Singh and Beesham (1999) and recently Singh and Kale (2009), we assume the well accepted power law relation between gravitational constant G and scale factor a as…”

Section: Solutions Of the Field Equationsmentioning

confidence: 99%

Bulk viscous LRS Bianchi-I Universe with variable G and decaying Λ

Yadav

Pradhan

Singh

2011

Astrophys Space Sci

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The present study deals with spatially homogeneous and totally anisotropic locally rotationally symmetric (LRS) Bianchi type I cosmological model with variable G and in presence of imperfect fluid. To get the deterministic model of Universe, we assume that the expansion (θ ) in the model is proportional to shear (σ ). This condition leads to A = B n , where A, B are metric potential. The cosmological constant is found to be decreasing function of time and it approaches a small positive value at late time which is supported by recent Supernovae Ia (SN Ia) observations. Also it is evident that the distance modulus curve of derived model matches with observations perfectly.

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“…Shri Ram and Singh (1997) studied the effect of timedependent bulk viscosity on the radiation of Friedmann models with zero curvature in BD theory. Singh and Beesham (1999) studied the effect of bulk viscosity on the evolution of the spatially flat Friedmann-Lemaitre-RobertsonWalker models in the context of open thermodynamical systems, which allow for particle creation, analyzed within the framework of BD theory. Reddy et al (2007) discussed the homogeneous axially symmetric Bianchi type-I radiating cosmological model with negative constant deceleration parameter in BD scalar-tensor theory gravitation.…”

Section: Introductionmentioning

confidence: 99%