Randall-Sundrum Brane Tensions
  We show that the singular sources in the energy-momentum tensor for the Randall-Sundrum brane world, viewed as a solution of type IIB supergravity, are composed of two elements. One of these is a D3-brane source with tension opposite in sign to the RS tension in five dimensions; the other arises from patching two regions of flat ten-dimensional spacetime. This resolves an apparent discrepancy between supersymmetry and the sign and magnitude of the RS tension. 
M. Cvetic, M.J. Duff, James T. Liu, H. Lu, C.N. Pope and K.S. Stelle