Dark Energy and Viscous Cosmology

Abstract

Singularities in the dark energy universe are discussed, assuming that there is a bulk viscosity in the cosmic fluid. In particular, it is shown how the physically natural assumption of letting the bulk viscosity be proportional to the scalar expansion in a spatially flat FRW universe can drive the fluid into the phantom region (w < -1), even if lies in the quintessence region (w > -1) in the non-viscous case.

11 pages. Printing error in eq.(23) corrected. To appear in Gen. Rel. Grav

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