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Hipólito-Ricaldi W S, Velten H E S and Zimdahl W 2009 JCAP
2009
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Fabris J C, Velten H E S and Zimdahl W 2010 Phys. Rev. D
2010
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Hipólito-Ricaldi W S, Velten H E S and Zimdahl W 2010 Phys. Rev. D
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2010
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2010

Unified models of the cosmological dark sector

Zimdahl, W, Hipólito-Ricaldi, W S, Velten, H E S

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We model the cosmological substratum by a viscous fluid that is supposed to provide a unified description of the dark sector and pressureless baryonic matter.

In the homogeneous and isotropic background the \textit{total} energy density of this mixture behaves as a generalized Chaplygin gas.
The perturbations of this energy density are intrinsically non-adiabatic and source relative entropy perturbations.
The resulting baryonic matter power spectrum is shown to be compatible with the 2dFGRS and SDSS (DR7) data.