BD-FRW Cosmology with Bulk Viscosity

Abstract

Exact cosmological solutions of the field equations in Brans-Dicke (BD) theory, with k = 0, FRW metric have been obtained in the presence of bulk viscosity. It is found that constant bulk viscosity leads to an inflationary solution for large values of the BD coupling parameter w. The case of radiative bulk viscosity during the decoupling era is investigated and the production of entropy is estimated.