A FRW Dark Fluid with a Non-Linear Inhomogeneous Equation of State

Details A FRW Dark Fluid with a Non-Linear Inhomogeneous Equation of State A FRW Dark Fluid with a Non-Linear Inhomogeneous Equation of State

2007-06-14

arxiv.org/abs/0706.2072v1

Eur.Phys.J.C52:223-228,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages pdf, 2 figures; to appear in Eur. Phys. J. C

Scientific paper

10.1140/epjc/s10052-007-0357-9

A dark Friedman-Robertson-Walker fluid governed by a non-linear inhomogeneous equation of state is considered which can be viewed as a conveniently simple paradigm for a whole class of models which exhibit phase transitions from a non-phantom towards a phantom era (superacceleration transition). From another side, such dark fluid models may describe also quintessence-like cosmic acceleration. Thermodynamical considerations for the processes involved, which are of great importance in the characterization of the global evolution of the corresponding universe, are given too. Connecting the proposed equation of state with an anisotropic Kasner universe with viscosity, we are led to the plausible conjecture of a dark fluid origin of the anisotropies in the early universe.

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