Viscous Chaplygin Gas Models as a Spherical Top-Hat Collapsing Fluids
arXiv:1610.09961 · doi:10.1142/S0218271816500747
Abstract
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.
arXiv comment19 pages; 12 figures. arXiv admin note: text overlap with arXiv:1110.6205, arXiv:1501.00486 by other authors
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