  As recently found by Youm [hep-th/0201268], the entropy of the universe will
no longer be expressible in the conventional Cardy-Verlinde form if one relaxes
the radiation dominance state equation and instead assumes a more general
equation of the form p=(\gamma-1)\rho, with \gamma a constant. We show that
Youm's generalized entropy formula remains valid when the cosmic fluid is no
longer ideal, but is allowed to possess a constant bulk viscosity \zeta. We
supply our analysis with some numerical estimates, thus calculating the scale
factor a(t) for a k=0 universe, and also calculate via a perturbative expansion
in \zeta the magnitude of the viscosity-induced correction to the scale factor
if the universe is radiation dominated.

General Relativity and Quantum Cosmology;High Energy Physics - Theory