Interacting modified Chaplygin gas in loop quantum cosmology

Jamil, Mubasher; Debnath, Ujjal

doi:10.1007/s10509-011-0651-8

Cited by 42 publications

(24 citation statements)

References 33 publications

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“…Chen et al [14] provided the parameter space for the existence of the accelerated scaling attractor in LQC with more general interacting term. When the Modified Chaplying Gas coupled to dark matter in the universe is described in the frame work LQC by Debnath et al [15] who resolved the famous cosmic coincidence problem in modern cosmology.…”

Section: Introductionmentioning

confidence: 99%

Dynamical study of DBI-essence in loop quantum cosmology and brane world

Bhadra¹,

Debnath²

2012

Eur. Phys. J. C

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We have studied homogeneous isotropic FRW model having dynamical dark energy DBI-essence with scalar field. The existence of cosmological scaling solutions restricts the Lagrangian of the scalar field φ. Choosing p = Xg(Xe λφ ), where X = −g µν ∂µφ∂νφ/2 with g is any function of Xe λφ and defining some suitable transformations, we have constructed the dynamical system in different gravity: (i) Loop Quantum Cosmology (LQC), (ii) DGP BraneWorld and (iii) RS-II Brane World. We have investigated the stability of this dynamical system around the critical point for three gravity models and investigated the scalar field dominated attractor solution in support of accelerated universe. The role of physical parameters have also been shown graphically during accelerating phase of the universe.

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Section: Introductionmentioning

confidence: 99%

Dynamical study of DBI-essence in loop quantum cosmology and brane world

Bhadra¹,

Debnath²

2012

Eur. Phys. J. C

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“…Various DE models have been investigated in this gravity [40,41]. 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].…”

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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“…In recent years, many DE models have been studied in the scenario of LQC [69,70]. Jamil et al [71] have explored the cosmic coincidence problem phenomenon of modern cosmology by taking a modified Chaplygin gas coupled to dark matter. Also, some authors found that the future singularity appearing in the standard FRW cosmology can be avoided by loop quantum effects [72].…”

Section: Loop Quantum Cosmology and Pilgrim Dark Energymentioning

confidence: 99%

Cosmological analysis of pilgrim dark energy in loop quantum cosmology

Jawad

2015

Eur. Phys. J. C

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The proposal of pilgrim dark energy is based on the speculation that phantom-like dark energy (with strong enough resistive force) can prevent black hole formation in the universe. We explore this phenomenon in the loop quantum cosmology framework by taking pilgrim dark energy with a Hubble horizon. We evaluate the cosmological parameters such as the Hubble parameter, the equation of state parameter, the squared speed of sound, and also cosmological planes like ω ϑ -ω ϑ and r -s on the basis of the pilgrim dark energy parameter (u) and the interacting parameter (d 2 ). It is found that the values of the Hubble parameter lie in the range 74 +0.005 −0.005 . It is mentioned here that the equation of state parameter lies within the ranges −1 ∓ 0.00005 for u = 2, 1 and (−1.12, −1), (−5, −1) for u = −1, −2, respectively. Also, the ω ϑ -ω ϑ planes provide a CDM limit, and freezing and thawing regions for all cases of u. It is also interesting to mention here that the ω ϑ -ω ϑ planes lie in the range (ω ϑ = −1.13 +0.24 −0.25 , ω ϑ < 1.32). In addition, the r -s planes also correspond to CDM for all cases of u. Finally, it is remarked that all the above constraints of the cosmological parameters (corresponding to u = ±2, ±1 and d 2 = 0.2 +1 −1 ) show consistency with different observational data like Planck, WP, BAO, H 0 , SNLS, and nine-year WMAP.

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Interacting modified Chaplygin gas in loop quantum cosmology

Cited by 42 publications

References 33 publications

Dynamical study of DBI-essence in loop quantum cosmology and brane world

Dynamical study of DBI-essence in loop quantum cosmology and brane world

Viscous Chaplygin gas models as spherical top-hat collapsing fluids

Cosmological analysis of pilgrim dark energy in loop quantum cosmology

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