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2011

Viscous dark fluid Universe: a unified model of the dark sector?

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

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The Universe is modeled as consisting of pressureless baryonic matter and a bulk viscous fluid which is supposed to represent a unified description of the dark sector.

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 nonadiabatic and source relative entropy perturbations.
The resulting baryonic matter power spectrum is shown to be compatible with the 2dFGRS and SDSS (DR7) data.

Viscous dark fluid Universe: a unified model of the dark sector? · Around

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