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Dark energy and viscous cosmology |
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| Authors: | |
| Institution: | (1) Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim, N-7491, Norway;(2) Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim, N-7491, Norway;(3) On leave from Tomsk State Pedagogical University, Tomsk, Russia |
| 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. |
| Keywords: | Dark energy Viscous cosmology Big Rip |
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