Generalized Chaplygin gas model with or without viscosity in the w- w' plane

Details Generalized Chaplygin gas model with or without viscosity in the w- w' plane Generalized Chaplygin gas model with or without viscosity in the w- w' plane

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012ap%26ss.337..493x&link_type=abstract

Astrophysics and Space Science, Volume 337, Issue 1, pp.493-498

Astronomy and Astrophysics

Astrophysics

Scientific paper

In this paper, we investigate the dynamics of generalized Chaplygin gas (GCG) model with or without viscosity in the w- w' plane, which is defined by the equation of state parameter and its time derivative with respect to the logarithm of the scale factor. We show that GCG model without viscosity approaches to a late time de Sitter attractor ( w g =-1) and behaves like a "freezing" scalar field for the parameter α constrained by the latest observational data. However, introducing viscosity exerts an influence on the evolution of w and affects the location of the late time attractor ( w g >-1) in viscous GCG model. We also find numerically such a transition from w'>0 to w'<0 as the universe expands in viscous GCG model different from GCG model without viscosity ( w'<0) in the w- w' plane.

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