  Exact solutions of the Einstein's field equations describing a spherically
symmetric cosmological model without a big bang or any other kind of
singularity recently obtained by Dadhich and Patel (2000) are revisited. The
matter content of the model is a shear-free perfect fluid with isotropic
pressure and a radial heat flux. Three different exact solutions are obtained
for both perfect fluid and fluid with bulk viscosity. It turns out that the
cosmological rerm $\Lambda(t)$ is a decreasing function of time, which is
consistent with recent observations of type Ia supernovae.

General Relativity and Quantum Cosmology