Abstract
The effect of bulk viscosity on the evolution of the homogeneous and isotropic cosmological models in the Brans-Dicke theory of gravitation is studied. Solutions are found, with a baratropic equation of state, a time-independent bulk viscosity, the gravitational “constant” inversely proportional to the age of the universe, and the mass of the universe (in the closed model) proportional to the square of its age; the expansion factor is a linear function of the cosmological time. For flat space, power law expansions are found, among them one that is related to extended inflation.
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Pimentel, L.O. Exact solutions in Brans-Dicke theory with bulk viscosity. Int J Theor Phys 33, 1335–1340 (1994). https://doi.org/10.1007/BF00670796
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DOI: https://doi.org/10.1007/BF00670796