Brane-world inflation without inflaton on the brane

Inspired by the Randall-Sundrum brane-world scenario, we investigate the possibility of brane-world inflation driven not by an inflaton field on the brane, but by a bulk;, dilaton-like gravitational field. hs a toy model for the dilaton-like gravitational field, we consider a minimally coupled massive scalar field in the bulk five-dimensional space-time, and look for a perturbative solution in the anti-de Sitter (AdS) background. For an adequate range of the scalar field mass, we find a unique solution that has a nontrivial dependence on the fifth dimensional coordinate, and that induces slow-roll inflation on the brane.