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Singh, Gyan Prakash; Deshpande, Revati; Singh, T.

doi:10.1023/a:1020963219962

Cited by 19 publications

(7 citation statements)

References 22 publications

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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: 99%

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: 99%

Early universe cosmology with particle creation: kinematics tests

Singh

Беешам

2011

Astrophys Space Sci

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“…The resulting models have constant deceleration parameter. Singh and Beesham [33], Singh et al [34] studied cosmological models having bulk viscosity and particle creation within the frame work of Brans-Dicke theory. Singh et al [35] have also studied the effect of particle production in higher derivative theory.…”

Section: Introductionmentioning

confidence: 99%

Bianchi Type I Cosmological Models with Expansion Driven by Particle Creation

Desikan¹

2018

Preprint

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A study of Bianchi Type I cosmological model is undertaken in the framework of creation of particles. To accommodate the creation of new particles, the universe is regarded as an Open thermodynamical system. The energy conservation equation is modified with the incorporation of a creation pressure in the energy momentum tensor. Exact solutions of the field equations are obtained (i) for a particular choice of the particle creation function and (ii) by considering the deceleration parameter to be constant. In the first model the behavior of the solution at late times is investigated. The physical aspects of the model have also been discussed. In the case of the second model we have restricted our analysis to the power law behaviour for the average scale factor. This leads to a particular form for the particle creation function. The behavior of the solution is investigated and the physical aspects of the model have also been discussed for the matter dominated era.

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“…This suggests that the bulk viscosity and particle creation are not only independent processes, but in general they lead to different histories of cosmic evolution. Desikan 20 , Singh and Beesham 21 , Johri and Pandey 22, Singh et al 23 , and Singh and Kale 24 have studied the role of particle creation and bulk viscosity in isotropic and anisotropic models.…”

Section: Introductionmentioning

confidence: 99%

Viscous FRW Models With Particle Creation in Early Universe

Singh

2012

Mod. Phys. Lett. A

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We discuss the dynamical effects of bulk viscosity and particle creation on the early evolution of the Friedmann -Robertson -Walker model in the framework of open thermodynamical systems. We consider bulk viscosity and particle creation as separate irreversible processes. Exact solutions of the Einstein field equations are obtained by using the "gammalaw" equation of state p = (γ − 1)ρ, where the adiabatic parameter γ varies with scale factor of the metric. We consider the cosmological model to study the early phases of the evolution of the universe as it goes from an inflationary phase to a radiation -dominated era in the presence of bulk viscosity and particle creation. Analytical solutions are obtained for particle number density and entropy for all models. It is found that, by choosing appropriate functions for particle creation rate and bulk viscous coefficient, the models exhibit singular and non-singular beginnings.

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Cited by 19 publications

References 22 publications

Early universe cosmology with particle creation: kinematics tests

Early universe cosmology with particle creation: kinematics tests

Bianchi Type I Cosmological Models with Expansion Driven by Particle Creation

Viscous FRW Models With Particle Creation in Early Universe

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