Bulk viscous cosmology: unified dark matter

Details Bulk viscous cosmology: unified dark matter Bulk viscous cosmology: unified dark matter

2010-12-14

arxiv.org/abs/1012.3045v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Review in the Advances in Astronomy focus issue on Dark Matter; 11 pages, 1 figure

Scientific paper

The bulk viscosity is introduced to model unified dark matter. The viscous unified model assumes the universe is filled with a single fluid with the bulk viscosity. We review the general framework of the viscous cosmology. The Hubble parameter has a direct connection with the bulk viscosity coefficient. For concrete form of the bulk viscosity, the Hubble parameter which has the scaling relation with the redshift can be obtained. We discuss two viscosity models and the cosmological evolution to which they lead. Using SNe Ia data, the viscosity model can be fitted. We briefly review the fitting method here.

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