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 it lies in the quintessence region (w > −1) in the non-viscous case.
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Brevik, I., Gorbunova, O. Dark energy and viscous cosmology. Gen Relativ Gravit 37, 2039–2045 (2005). https://doi.org/10.1007/s10714-005-0178-9
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DOI: https://doi.org/10.1007/s10714-005-0178-9