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.
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We are grateful to Professor Sergei Odintsov for helpful discussions.
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Brevik, I., Obukhov, V.V. & Timoshkin, A.V. Quasi-Rip and Pseudo-Rip universes induced by the fluid inhomogeneous equation of state. Astrophys Space Sci 344, 275–279 (2013). https://doi.org/10.1007/s10509-012-1328-7
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DOI: https://doi.org/10.1007/s10509-012-1328-7