Bulk viscosity and particle creation in Brans-Dicke theory. (English) Zbl 1018.83019

Summary: The effect of bulk viscosity on the evolution of the spatially flat Friedmann-Lemaitre-Robertson-Walker (FLRW) models in the context of open thermodynamical systems, which allow for particle creation, is analysed within the framework of Brans-Dicke (BD) theory. The BD field equations are modified with the incorporation of a creation pressure and bulk viscous stress. A class of physically plausible models has been taken into consideration. The behaviour of the particle number density and bulk viscosity is discussed with the evolution of the Brans-Dicke scalar field.


83D05 Relativistic gravitational theories other than Einstein’s, including asymmetric field theories
83F05 Relativistic cosmology
83C55 Macroscopic interaction of the gravitational field with matter (hydrodynamics, etc.)
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