Regularization of brane induced gravity

Abstract

We study the regularization of theories of ``brane induced'' gravity in codimension $N>1.$ The brane can be interpreted as a thin dielectric with a large dielectric constant, embedded in a higher dimensional space. The kinetic term for the higher dimensional graviton is enhanced over the brane. A four dimensional gravitation is found on the brane at distances smaller than a critical distance $r<{r}_{c},$ and is due to the exchange of a massive resonant graviton. The crossover scale ${r}_{c}$ is determined by the mass of the resonance. The suppression of the couplings of light Kaluza-Klein modes to brane matter results in a higher dimensional force law at large distances. We show that the resulting theory is free of ghosts or tachyons.