Summary
The effect of bulk viscosity on the evolution of the homogeneous and isotropic cosmological models is considered. Solutions are found, with a barotropic equation of state, and a viscosity coefficient that is proportional to a power of the energy density of the universe. For flat space, power law expansions, related to extended inflation are found as well as exponential solutions, related to old inflation; also a solution with expansion that is an exponential of an exponential of the time is found.
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References
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Pimentel, L.O., Diaz-Rivera, L.M. Effects of bulk viscosity on cosmological evolution. Nuov Cim B 109, 1317–1321 (1994). https://doi.org/10.1007/BF02722842
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DOI: https://doi.org/10.1007/BF02722842