Interacting Viscous Modified Chaplygin Gas Cosmology in Presence of Cosmological Constant

Karimiyan, K.; Naji, J.

doi:10.1007/s10773-014-2038-4

Cited by 1 publication

(2 citation statements)

References 32 publications

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“…Using Eqs. (29), (30) and (33) in Eq. (48) we get the time evolution of the total entropy for the case Fig.…”

Section: Generalized Second Law Of Thermodynamicsmentioning

confidence: 99%

“…Pun et al [30] considered a generalization of the Chaplygin gas model and by assuming the presence of a bulk viscous type dissipative term in the effective thermodynamic pressure of the gas and by considering dissipative effects described by truncated Israel-Stewart model they [30] had shown that viscous Chaplygin gas model offers an effective dynamical possibility for replacing the cosmological constant. Effect of viscosity in Chaplygin gas with different modifications have been studied in [31][32][33]. Cataldo et al [39] investigated dissipative processes in the universe in the full causal Israel-Stewart-Hiscock theory and showed that the negative pressure generated by the bulk viscosity cannot avoid that the dark energy of the universe to be phantom energy.…”

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Israel-Stewart Approach to Viscous Dissipative Extended Holographic Ricci Dark Energy Dominated Universe

Chattopadhyay¹

2016

Advances in High Energy Physics

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This paper reports a study on the truncated Israel-Stewart formalism for bulk viscosity using the extended holographic Ricci dark energy (EHRDE), where the density of dark energy is given as a combination of the Hubble parameter and its derivative. The equations of motion are integrated and the resulting model is analysed under many aspects, including the state finder parameters and the generalised thermodynamics second law. Under the consideration that the universe is dominated by EHRDE the evolution equation for the bulk viscous pressure Π in the framework of the truncated Israel-Stewart theory has been taken as τΠ + Π = −3ξH, where τ is the relaxation time and ξ is the bulk viscosity coefficient.Considering effective pressure as a sum of thermodynamic pressure of EHRDE and bulk viscous pressure it has been observed that under the influence of bulk viscosity the EoS parameter w DE is behaving like phantom i.e. w DE ≤ −1. It has been observed that the magnitude of the effective pressure p ef f = p + Π is decaying with time. We also investigated the case for a specific choice of scale factor namely a(t) = (t − t 0 ) β 1−α . For this choice we have observed that a transition from quintessence to phantom is possible for the equation of state parameter. However, the ΛCDM phase is not attainable by the statefinder trajectories for this choice. Finally it has been observed that in both of the cases the generalized second law of thermodynamics is valid for the viscous EHRDE dominated universe enveloped by the apparent horizon.

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“…Using Eqs. (29), (30) and (33) in Eq. (48) we get the time evolution of the total entropy for the case Fig.…”

Section: Generalized Second Law Of Thermodynamicsmentioning

confidence: 99%

mentioning

confidence: 99%

Israel-Stewart Approach to Viscous Dissipative Extended Holographic Ricci Dark Energy Dominated Universe

Chattopadhyay¹

2016

Advances in High Energy Physics

View full text Add to dashboard Cite

show abstract

Interacting Viscous Modified Chaplygin Gas Cosmology in Presence of Cosmological Constant

Cited by 1 publication

References 32 publications

Israel-Stewart Approach to Viscous Dissipative Extended Holographic Ricci Dark Energy Dominated Universe

Israel-Stewart Approach to Viscous Dissipative Extended Holographic Ricci Dark Energy Dominated Universe

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