Dynamics of interacting phantom scalar field dark energy in loop quantum cosmology

We investigate the background dynamics when dark energy is coupled to dark matter in the universe described by loop quantum cosmology. We consider dark energy of the form modified Chaplygin gas. The dynamical system of equations is solved numerically and a stable scaling solution is obtained. It henceforth resolves the famous cosmic coincidence problem in modern cosmology. The statefinder parameters are also calculated to classify this dark energy model.Comment: 7 pages, 7 figures, accepted for publication in 'Astrophysics and Space Science

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“…The modified Friedmann equation for LQC is given by (Wu and Zhang 2008;Chen et al 2008;Fu et al 2008)…”

Section: The Modelmentioning

confidence: 99%

Interacting modified Chaplygin gas in loop quantum cosmology

Jamil

Debnath

2011

Astrophys Space Sci

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“…The cosmological evolution in LQC has been widely studied for quintessence and phantom DE models [40]. The modified Friedmann equation for Loop Quantum Cosmology is given by [29,41,42]…”

Section: Basic Equations Of Loop Quantum Gravity Modelmentioning

confidence: 99%

Interacting Generalized Cosmic Chaplygin Gas in Loop Quantum Cosmology: A Singularity Free Universe

Chowdhury

Rudra

2012

Int J Theor Phys

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In this work we investigate the background dynamics when dark energy is coupled to dark matter with a suitable interaction in the universe described by Loop quantum cosmology. Dark energy in the form of Generalised Cosmic Chaplygin gas is considered. A suitable interaction between dark energy and dark matter is taken into account in order to at least alleviate (if not solve) the cosmic coincidence problem. The dynamical system of equations is solved numerically and a stable scaling solution is obtained. A significant attempt towards the solution of the cosmic coincidence problem is taken. The statefinder parameters are also calculated to classify the dark energy model. Graphs and phase diagrams are drawn to study the variations of these parameters. It is seen that the background dynamics of Generalised Cosmic Chaplygin gas is completely consistent with the notion of an accelerated expansion in the late universe. From the graphs, generalised cosmic Chaplygin gas is identified as a dark fluid with a lesser negative pressure compared to Modified Chaplygin gas, thus supporting a 'No Big Rip' cosmology. It has also been shown that in this model the universe follows the power law form of expansion around the critical point, which is consistent with the known results. Future singularities that may be formed in this model as an ultimate fate of the universe has been studied in detail. It was found that the model is completely free from any types of future singularities.

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“…Jamil et al [42] have investigated the cosmic coincidence problem by assuming the MCG coupled to DM. It has also been found that the future singularity appearing in the standard FRW cosmology can be avoided by loop quantum effects [43]. Chakraborty et al [44] have tested MCG in LQC.…”

Section: Sthc For Vmvcg In Loop Quantum Cosmologymentioning

confidence: 99%

Viscous Chaplygin gas models as spherical top-hat collapsing fluids

Jawad

Iqbal

2016

Int. J. Mod. Phys. D

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We study the spherical top-hat collapse in Einstein gravity and loop quantum cosmology by taking the non-linear evolution of viscous modified variable chaplygin gas and viscous generalized cosmic chaplygin gas. We calculate the equation of state parameter, square speed of sound, perturbed equation of state parameter, perturbed square speed of sound, density contrast and divergence of peculiar velocity in perturbed region and discussed their behavior. It is observed that both chaplygin gas models support the spherical collapse in Einstein as well as loop quantum cosmology because density contrast remains positive in both cases and the perturbed equation of state parameter remains positive at the present epoch as well as near future. It is remarked here that these parameters provide the consistence results for both chaplygin gas models in both gravities.

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Dynamics of interacting phantom scalar field dark energy in loop quantum cosmology

Cited by 71 publications

References 84 publications

Interacting modified Chaplygin gas in loop quantum cosmology

Interacting modified Chaplygin gas in loop quantum cosmology

Interacting Generalized Cosmic Chaplygin Gas in Loop Quantum Cosmology: A Singularity Free Universe

Viscous Chaplygin gas models as spherical top-hat collapsing fluids

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