Journal
INTERNATIONAL JOURNAL OF MODERN PHYSICS D
Volume 15, Issue 5, Pages 767-775Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0218271806008528
Keywords
viscous cosmology; Big Rip; dark energy; modified gravity
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We consider a modified form of gravity in which the action contains a power a 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 nonviscous 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. Gravit. 37, 2039 (2005).
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