The fate of the radion in models with metastable graviton

We clarify some general issues in models where gravity is localized at inte rmediate distances. We introduce the radion mode, which is usually neglecte d, and we point out that its role in the model is crucial. We show that the brane bending effects discussed in the literature can be obtained in a for malism where the physical origin is manifest. The model violates positivity of energy due to a negative tension brane, which induces a negative kineti c term for the radion. The very same effect that violates positivity is res ponsible for the recovery of conventional Einstein gravity at intermediate distances.