Imbedding a Schwarzschild mass into cosmology

We develop a method for imbedding a Schwarzschild mass into a zero-curvature universe. We work with curvature coordinates (R,T), in terms of which the metric has the form ds²(R,T)=A^-1(R,T)dR²+R²dΩ²-B(R,T)dT², and coordinates (R,τ), where τ is measured by radially moving geodesic clocks. We solve the field equations for a stress-energy tensor that corresponds to a radially moving perfect geodesic fluid outside some boundary Rb. Inside Rb we take the stress-energy tensor to be composed of a perfect-fluid part and a Schwarzschild matter part. Specific examples of imbedding a mass into a de Sitter universe and a pressure-free Einstein---de Sitter universe are given, and we show how to extend our methods to general zero-curvature universes. A consequence of our results is that there will be spiralling of planetary orbits when a mass such as our Sun is imbedded in a universe. We relate our work to recent work done by Dirac with regard to his Large Numbers hypothesis.