Crossing of the w=-1 Barrier in Two-Fluid Viscous Modified Gravity

Details Crossing of the w=-1 Barrier in Two-Fluid Viscous Modified Gravity Crossing of the w=-1 Barrier in Two-Fluid Viscous Modified Gravity

2006-03-08

arxiv.org/abs/gr-qc/0603025v1

Gen.Rel.Grav.38:1317-1328,2006

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

16 pages latex, no figures

Scientific paper

10.1007/s10714-006-0309-y

Singularities in the dark energy late universe are discussed, under the assumption that the Lagrangian contains the Einstein term R plus a modified gravity term of the form R^\alpha, where \alpha is a constant. It is found, similarly as in the case of pure Einstein gravity [I. Brevik and O. Gorbunova, Gen. Rel. Grav. 37 (2005), 2039], that the fluid can pass from the quintessence region (w>-1) into the phantom region (w<-1) as a consequence of a bulk viscosity varying with time. It becomes necessary now, however, to allow for a two-fluid model, since the viscosities for the two components vary differently with time. No scalar fields are needed for the description of the passage through the phantom barrier.

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