2010

Viscous dark fluid universe

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

Understand

We investigate the cosmological perturbation dynamics for a universe consisting of pressureless baryonic matter and a viscous fluid, the latter representing a unified model 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 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.

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