Inhomogeneous viscous fluids in FRW universe

Understand

We give a brief review of some aspects of inhomogeneous viscous fluids in a flat Friedmann-Robertson-Walker Universe.

• In general, it is pointed out that several fluid models may bring the future Universe evolution to become singular, with the appearance of the so-called Big Rip scenario.
• We investigate the effects of fluids coupled with dark matter in a de Sitter Universe, by considering several cases.
• Due to this coupling, the coincidence problem may be solved, and if the de Sitter solution is stable, the model is also protected against the Big Rip singularity.