WAVE FUNCTION OF THE RADION WITH BPS BRANES.

We investigate coupled gravity and a bulk scalar field on a slice of AdS5 bulk with special BPS branes at the two ends. With a careful treatment of the general coordinate invariance, the complete tensor–scalar spectrum is presented. There are two massless zero modes in the scalar sector, the radion and a dilatonic zero mode. The four-dimensional effective action is of biscalar–tensor type. [ABSTRACT FROM AUTHOR]