AdS/CFT and gravity

The radiation-dominated k=0 FRW cosmology emerges as the induced metric on a codimension one hypersurface of constant extrinsic curvature in the five-dimensional AdS-Schwarzschild solution. That we should get FRW cosmology in this way is an expected result from AdS/CFT in light of recent comments regarding the coupling of gravity to boundary conformal field theories. I remark on how this calculation hears on the understanding of the Randall-Sundrum alternative to compactification. A generalization of the AdS/CFT prescription for computing Green's functions is suggested, and it is shown how gravity emerges from it with a strength G(4)=2G(5)/L. Some upper bounds are set on the radius of curvature L of AdS(5). One of them comes from estimating the rate of leakage of visible sector energy into the CFT. That rate is connected via a unitarity relation to deviations from Newton's force law at short distances. The best bound on L obtained in this paper comes from a match to the parameters of string theory. It is L less than or similar to1 nm if the string scale is 1 GeV. Higher string scales imply a tighter bound on L.