Viscous Lambda CDM universe models

Grøn, Øyvind; Mostafapoor, Nouraddin
Journal article, Peer reviewed
© the author(s) 2011. this article is published with open access at springerlink.com
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URI
https://hdl.handle.net/10642/1104
Date
2011-03-30
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Original version
Grøn, Ø. & Mostafapoor, N. (2011). Viscous Lambda CDM universe models. Astrophysics and Space Science, 333 (2)   http://dx.doi.org/10.1007/s10509-011-0690-1
Abstract
We explore flat ACDM 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 ρm, 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.
Publisher
Springer Verlag
Series
Astrophysics and Space Science;333 (2)