Emergent universe with interacting fluids and the generalized second law of thermodynamics

Paul, Bikash Chandra; Majumdar, A. S.

doi:10.1088/0264-9381/32/11/115001

Cited by 22 publications

(29 citation statements)

References 60 publications

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“…The analysis has been carried out in a flat universe which is in accordance with present cosmological observations. The emergent universe scenario in the presence of interacting fluids have also been studied recently [18]. This picture have received considerable support from other approaches too.…”

Section: Introductionmentioning

confidence: 92%

“…Eq. (s) (17,18) has the same form as the corresponding ones in [17] except the fact that the matter creation rate measured by the parameter β appears in these equations explicitly. This in turn implies that although the composition of the universe remains the same as in [17], ρ 2 scales with a −3(1+A)(1−β)/2 and ρ 3 scales with a −3(1+A) (1−β) showing once again the role played by matter creation.…”

Section: Emergent Universe Scenario With Matter Creationmentioning

confidence: 99%

“…We present two entries in the table below to identify the components from eq(s) (17,18) for ρ and p. The first term in these equations behaves like a cosmological constant and may account for dark energy. The physical content of the other two terms are listed in the table.…”

Section: Appendixmentioning

confidence: 99%

See 2 more Smart Citations

Emergent Universe with Particle Production

2016

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The possibility of an emergent universe solution to Einstein's field equations allowing for an irreversible creation of matter at the expense of the gravitational field is shown. With the universe being chosen as spatially flat FRW spacetime together with equation of state proposed in [17], the solution exists when the ratio of the phenomenological matter creation rate to the number density times the Hubble parameter is a number β of the order of unity and independent of time. The thermodynamic behaviour is also determined for this solution. Interestingly, we also find that an emergent universe scenario is present with usual equation of state in cosmology when the matter creation rate is chosen to be a constant. More general class of emergent universe solutions are also discussed.

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Section: Introductionmentioning

confidence: 92%

Section: Emergent Universe Scenario With Matter Creationmentioning

confidence: 99%

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Emergent Universe with Particle Production

2016

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“…Attempts to avoid this singularity has been a central area of research. Emergent universe models have attracted considerable interest in this context [1]- [5]. This is a model which in the infinite past (t → −∞) is almost static and then proceeds to have an inflationary behaviour.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics and emergent universe

Ghosh

Gangopadhyay

2017

Mod. Phys. Lett. A

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We show that in the isentropic scenario the first order thermodynamical particle creation model gives an emergent universe solution even when the chemical potential is non-zero. However there exists no emergent universe scenario in the second order non-equilibrium theory for the particle creation model. We then point out a correspondence between the particle creation model with barotropic equation of state and the equation of state giving rise to an emergent universe without particle creation in spatially flat FRW cosmology.

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“…al. [22] investigated the emergent universe scenario in the presence of interacting (two or three) fluids having non-linear equation of state. The present work is an extension (in some sense) of the studies in references [20] and [21].…”

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confidence: 99%

A model of the emergent Universe in inhomogeneous spacetime

Bhattacharya

Chakraborty

2016

Class. Quantum Grav.

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A scenario of an emergent universe is constructed in the background of an inhomogeneous spacetime model which is asymptotically (at spatial infinity) FRW space-time. The cosmic substratum consists of non-interacting two components, namely a) homogeneous and isotropic fluid but dissipative in nature and b) an inhomogeneous and anisotropic barotropic fluid. In non-equilibrium thermodynamic prescription (second order deviations), particle creation mechanism is considered the cause for the dissipative phenomena. It is found that for constant value of the particle creation rate parameter there exists a scenario of emergent universe.There are lot of works to remove the bad feature of standard cosmology i.e. the initial big bang singularity. Usually, the different cosmological scenarios proposed to overcome this non-physical aspect are classified into two groups: i) model for bouncing universes or ii) model of emergent universes. The second alternative is related to singularity free inflationary model in context of classical general relativity and its formulation is the aim of the present work. The scenario of emergent universe has the following features: a) ever existing, b) absence of any time-like singularity and c) almost static behaviour in the infinite past (t → −∞) ( and then evolves into an inflationary stage). Also in the literature, the model of emergent universe is considered as a modern and extended version of the Lemaitre-Eddington universe. The proposal for emergent scenario was started long back in 1967 by Harrison [1]. He obtained a closed model of the universe with radiation which in the asymptotic past is nothing but the state of an Einstein static model. Then after a gap of nearly forty years, Ellis and Maartens [2], Ellis et.al.[3] formulated a model of closed universe with non-interacting two fluid components: a minimally coupled scalar field with a typical self interacting potential and a barotropic fluid having equation of state: p = ωρ (− 1 3 ≤ ω ≤ 1). Although they were not able to give analytic * subhra.maths@presiuniv.ac.in

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Emergent universe with interacting fluids and the generalized second law of thermodynamics

Cited by 22 publications

References 60 publications

Emergent Universe with Particle Production

Emergent Universe with Particle Production

Thermodynamics and emergent universe

A model of the emergent Universe in inhomogeneous spacetime

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