Viscous ΛCDM universe models

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Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ap%26ss.333..357m&link_type=abstract

Astrophysics and Space Science, Volume 333, Issue 2, pp.357-368

Astronomy and Astrophysics

Astrophysics

2

The Flat Λcdm Model, Bulk Viscosity, Scale Factor, Hubble Parameter, Energy Density, Deceleration Parameter, Statefinder Parameters

Scientific paper

We explore flat ΛCDM models with bulk viscosity, and study the role of the bulk viscosity in the evolution of these universe models. The dynamical equations for these models are obtained and solved for some cases of bulk viscosity. We obtain differential equations for the Hubble parameter H and the energy density of dark matter ρ m , for which we give analytical solutions for some cases and for the general case we give a numerical solution. Also we calculate the statefinder parameters for these models and display them in the s- r-plane.

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