A non-standard matter distribution in the RS1 model and the coupling   constant of the radion
  In the zero mode approximation we solve exactly the equations of motion for linearized gravity in the Randall-Sundrum model with a non-standard distribution of matter in the neighbourhood of the negative tension brane. It is shown that the form of this distribution can strongly affect the coupling of the radion to matter. We believe that such a situation can arise in models with a realistic mechanisms of matter localization. 
Mikhail N. Smolyakov, Igor P. Volobuev