Little Rip cosmological models with time-dependent equation of state

Abstract

Specific dark energy models, leading to the Little Rip (LR) cosmology in the far future, are investigated. Conditions for the occurrence of LR in terms of the parameters present in the proposed equation of state for the dark energy cosmic fluid are studied. Estimates about the time needed before the occurrence of the rip singularity in the standard LR model and the model in which the universe approaches the de Sitter space-time asymptotically, are given.

11 pages, latex, to appear in Mod. Phys. Lett. A. Abstract reformulated

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• Quasi-Rip and Pseudo-Rip Universes Induced by the Fluid Inhomogeneous Equation of State
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• Rip Brane Cosmology from 4d Inhomogeneous Dark Fluid Universe
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• Cosmic anisotropic doomsday in Bianchi type I universes