Viscous Generalized Chaplygin Gas as a Unified Dark Fluid: Including Perturbation of Bulk Viscosity

Abstract

In this paper, we continue our previous work of studying viscous generalized Chaplygin gas (VGCG) as a unified dark fluid but including the bulk viscosity perturbation. By using the currently available cosmic observational data from SNLS3, BAO, HST and recently released Planck, we gain the constraint on bulk viscosity coefficient: ${\zeta }_0=0.0000138_{-0.0000105-0.0000138-0.0000138}^{+0.00000614+0.0000145+0.0000212}$ in $1,2,3\sigma$ regions respectively via Markov Chain Monte Carlo method. The result shows that when considering perturbation of bulk viscosity, the currently cosmic observations favor a smaller bulk viscosity coefficient.

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Cited by in corpus (4)

• The universe dominated by the extended Chaplygin gas
• Interacting Holographic Extended Chaplygin Gas and Phantom Cosmology in the Light of BICEP2
• Revisiting Chaplygin gas cosmologies with the recent observations of high-redshfit quasars
• Viscous Chaplygin Gas Models as a Spherical Top-Hat Collapsing Fluids