2012/11/23 by Iver Brevik · 1 citation
Physics and Astronomy · #gr-qc
paper · pdf · doi:10.3390/e14112302
published as Entropy 2012, 14, 2302-2310 · 9 pages, no figure; reference list updated and expanded
arxiv created 2012/11/23 · arxiv updated 2012/11/26
A bulk viscosity is introduced in the formalism of modified gravity. It is shown that, on the basis of a natural scaling law for the viscosity, a simple solution can be found for quantities such as the Hubble parameter and the energy density. These solutions may incorporate a viscosity-induced Big Rip singularity. By introducing a phase transition in the cosmic fluid, the future singularity can nevertheless in principle be avoided.