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Analytic properties of physical quantities in the cosmic fluid such as energydensity \rho(t) and Hubble parameter H(t) are investigated near the futuresingularity (Big Rip). Both 4D and 5D cosmologies are considered (theRandall-Sundrum II model in the 5D case), and the fluid is assumed to possess abulk viscosity \zeta. We consider both Einstein gravity and modified gravity,where in the latter case the Lagrangian contains a term R^\alpha with \alpha aconstant. If \zeta is proportional to the power (2\alpha-1) of the scalarexpansion, the fluid can pass from the quintessence region into the phantomregion as a consequence of the viscosity. A property worth noticing is that the4D singularity on the brane becomes carried over to the bulk region.

A Brief Review of the Singularities in 4D and 5D Viscous Cosmologies Near the Future Singularity