Quasi-Rip and Pseudo-Rip Universes Induced by the Fluid Inhomogeneous Equation of State

Abstract

We investigate specific models for a dark energy universe leading to Quasi-Rip and Pseudo-Rip cosmologies. In the Quasi-Rip model the equation of state parameter w is less than -1 in the first stage, but becomes larger than -1 in the second stage. In the Pseudo-Rip model the Hubble parameter tends to a constant value in the remote future, although w is always less than -1. Conditions for the appearance of the Quasi-Rip and the Pseudo-Rip in terms of the parameters in the equation of state are determined. Analogies with the theory of viscous cosmology are discussed.

12 pages latex, no figures; to appear in Astrophys. and Space Science

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• Little Rip, Pseudo Rip and bounce cosmology with generalized equation of state in non-standard backgrounds
• Holographic bounce cosmological models induced by viscous dark fluid from a generalized non-singular entropy function
• Rip Cosmology via Inhomogeneous Fluid
• Cosmic anisotropic doomsday in Bianchi type I universes