Crossing of the w=-1 barrier in viscous modified gravity

Details Crossing of the w=-1 barrier in viscous modified gravity Crossing of the w=-1 barrier in viscous modified gravity

2006-01-24

arxiv.org/abs/gr-qc/0601100v1

Int.J.Mod.Phys.D15:767-776,2006

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

12 pages, latex, no figures

Scientific paper

10.1142/S0218271806008528

We consider a modified form of gravity in which the action contains a power alpha of the scalar curvature. It is shown how the presence of a bulk viscosity in a spatially flat universe may drive the cosmic fluid into the phantom region (w<-1) and thus into a Big Rip singularity, even if it lies in the quintessence region (w>-1) in the non-viscous case. The condition for this to occur is that the bulk viscosity contains the power (2 alpha-1) of the scalar expansion. Two specific examples are discussed in detail. The present paper is a generalization of the recent investigation dealing with barrier crossing in Einstein's gravity: I. Brevik and O. Gorbunova, Gen. Relativ. Grav. 37 (2005) 2039.

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