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

Singh, G. P.; Beesham, A.

Aust. J. Phys. 52, No. 6, 1039-1049 (1999).

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.

MSC:

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.)

Keywords:

Brans-Dicke theory; Friedmann-Lemaitre-Robertson-Walker models; bulk viscous stress