2007

Bulk Viscous Cosmology

Colistete Jr., R., Fabris, J. C., Tossa, J. et al.

Understand

We propose a scenario in which the dark components of the Universe are manifestations of a single bulk viscous fluid.

Using dynamical system methods, a qualitative study of the homogeneous, isotropic background scenario is performed in order to determine the phase space of all possible solutions.
The specific model which we investigate shares similarities with a generalized Chaplygin gas in the background but is characterized by non-adiabatic pressure perturbations.
This model is tested against supernova type Ia and matter power spectrum data.

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