Piao, YS (reprint author), Chinese Acad Sci, Inst High Energy Phys, POB 9184, Beijing 100039, Peoples R China.
We extend the Randall-Sundrum (RS) model by adding a fundamental scalar field in the bulk, then study the multi-field assisted inflationary solution on the brane. It is shown that this model not only satisfies observations, but also provides a solution to the hierarchy problem. Furthermore in comparison to the chaotic inflation model with a single field in four space-time dimensions, the parameters in our model required for a successful inflation are natural. (C) 2002 Elsevier Science B.V. All rights reserved.