Cosmological Models with Bulk Viscosity in the Presence of Particle Creation

Desikan, Kalyani

doi:10.1023/a:1018826530976

Cited by 30 publications

(13 citation statements)

References 11 publications

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“…Our analysis generalize the ansatz presented in [8] to make it even suitable for the description of a spatially negative curved FLRW model and the resulting early dynamics (analysed close to the thermodynamic equilibrium and in absence of bulk viscosity, which, in agreement to what below discussed in section 2 should be appropriately treated in this framework only as a small perturbative term) appears to be, in both the cases, as deeply modified by the processes of matter creation. Indeed in the case of a flat FLRW universe we get a nonsingular cosmology in correspondence to an open set of the allowed parameters.…”

Section: Introductionsupporting

confidence: 68%

“…Now, to the existence of such dissipative processes is associated an entropy production determined, in agreement with (8), by the relation:…”

Section: Dynamical Modelmentioning

confidence: 74%

“…In [8] the influence of a particles creation term on a FLRW universe, having a flat three-dimensional space, was studied in presence of bulk viscosity, by showing how the assumption of a reasonable ansatz (for the rate of particles creation) leads to the appearance of nonsingular cosmologies in correspondence to some particular choice of the free parameters of the model.…”

Section: Introductionmentioning

confidence: 99%

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Influence of particle creation on flat and negative curved FLRW universes

Montani

2000

Class. Quantum Grav.

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We present a dynamical analysis of the (classical) spatially flat and negative curved Friedmann-Lameître-Robertson-Walker (FLRW) universes evolving, (by assumption) close to the thermodynamic equilibrium, in presence of a particles creation process, described by means of a realiable phenomenological approach, based on the application to the comoving volume (i. e. spatial volume of unit comoving coordinates) of the theory for open thermodynamic systems.In particular we show how, since the particles creation phenomenon induces a negative pressure term, then the choice of a well-grounded ansatz for the time variation of the particles number, leads to a deep modification of the very early standard FLRW dynamics.More precisely for the considered FLRW models, we find (in addition to the limiting case of their standard behaviours) solutions corresponding to an early universe characterized respectively by an "eternal" inflationary-like birth and a spatial curvature dominated singularity. In both these cases the so-called horizon problem finds a natural solution.

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Section: Introductionsupporting

confidence: 68%

“…Now, to the existence of such dissipative processes is associated an entropy production determined, in agreement with (8), by the relation:…”

Section: Dynamical Modelmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

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Influence of particle creation on flat and negative curved FLRW universes

Montani

2000

Class. Quantum Grav.

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“…Sudharsan and Johri [27] investigated the effect of bulk viscosity on the evolution of the FRW models in the context of open thermodynamic systems. The effect of bulk viscosity with a time varying bulk viscous coefficient in the framework of irreversible thermodynamics for homogeneous and isotropic space-times has been considered by Desikan [28]. By choosing appropriate functions for the particle creation rates these models lead to non-singular beginnings and inflationary behavior.…”

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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“…Huang [14] has studied Bianchi type models with bulk viscosity as a power function of energy density and when the universe is filled with stiff matter. The effect of bulk viscosity, with a time varying bulk viscous coefficient, on the evolution of isotropic FRW models in the context of open thermodynamics system was studied by Desikan [15]. Ray et al [16] have studied anisotropic-charge fluid sphere with varying cosmological constant.…”

Section: Introductionmentioning

confidence: 99%