Causal viscous cosmological models with variable G and Lambda

Einstein's equations with variable gravitational and cosmological "constant s" are considered in the presence of a bulk viscous fluid source described by the truncated causal theory of Israel-Stewart, for the spatially flat ho mogeneous and isotropic universe. A solution is found in which the cosmolog ical term varies inversely with the square of time. However, the gravitatio nal constant G is found to be increasing with time.