Infinitely Large New Dimensions

We construct intersecting brane configurations in Anti-de-Sitter space localizing gravity to the intersection region, with any number $n$ of extra dimensions. This allows us to construct two kinds of theories with infinitely large new dimensions, TeV scale quantum gravity and sub-millimeter deviations from Newton's Law. The effective 4D Planck scale $M_{Pl}$ is determined in terms of the fundamental Planck scale $M_{\ast }$ and the $AdS$ radius of curvature $L$ via the familiar relation $M_{Pl}^2\sim M_{\ast }^{2+n}{L}^n$; $L$ acts as an effective radius of compactification for gravity on the intersection. Taking $M_{\ast }\sim$ TeV and $L\sim$ sub-mm reproduces the phenomenology of theories with large extra dimensions. Alternately, taking $M_{\ast }\sim L^{-1}\sim M_{Pl}$, and placing our 3-brane a distance $\sim 100M_{Pl}^{-1}$ away from the intersection gives us a theory with an exponential determination of the Weak/Planck hierarchy.