Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-06-04
Phys.Lett.B639:144-150,2006
Physics
High Energy Physics
High Energy Physics - Theory
LaTeX file, 9 pages, extended version, to appear in PLB
Scientific paper
10.1016/j.physletb.2006.06.065
We suggest to generalize the dark energy equation of state (EoS) by introduction the relaxation equation for pressure which is equivalent to consideration of the inhomogeneous EoS cosmic fluid which often appears as the effective model from strings/brane-worlds. As another, more wide generalization we discuss the inhomogeneous EoS which contains derivatives of pressure. For several explicit examples motivated by the analogy with classical mechanics the accelerating FRW cosmology is constructed. It turns out to be the asymptotically de Sitter or oscillating universe with possible transition from deceleration to acceleration phase. The coupling of dark energy with matter in accelerating FRW universe is considered, it is shown to be consistent with constrained (or inhomogeneous) EoS.
Nojiri Shin'ichi
Odintsov Sergei D.
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