2012/12/03 by I. Brevik, V. V. Obukhov, A. V. Timoshkin · 1 citation
Physics and Astronomy · #gr-qc
paper · pdf · doi:10.1007/s10509-012-1328-7
published as Astrophys. Space Sci. (2013) 344, 275 · 12 pages latex, no figures; to appear in Astrophys. and Space Science
arxiv created 2012/12/03 · arxiv updated 2013/06/03
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.