2 research outputs found
Dark energy cosmology with generalized linear equation of state
Dark energy with the usually used equation of state , where
is hydrodynamically unstable. To overcome this drawback we consider
the cosmology of a perfect fluid with a linear equation of state of a more
general form , where the constants and
are free parameters. This non-homogeneous linear equation of state provides the
description of both hydrodynamically stable () and unstable
() fluids. In particular, the considered cosmological model describes
the hydrodynamically stable dark (and phantom) energy. The possible types of
cosmological scenarios in this model are determined and classified in terms of
attractors and unstable points by the using of phase trajectories analysis. For
the dark energy case there are possible some distinctive types of cosmological
scenarios: (i) the universe with the de Sitter attractor at late times, (ii)
the bouncing universe, (iii) the universe with the Big Rip and with the
anti-Big Rip. In the framework of a linear equation of state the universe
filled with an phantom energy, , may have either the de Sitter attractor
or the Big Rip.Comment: 12 pages, 11 figures, typos corrected, references adde