Fatal Missing Link from Classical Brane Dynamics to Einstein Gravity and   a Quantum Theoretical Solution
  It is argued that the Einstein equation on a braneworld at low curvature cannot be derived from its classical brane dynamics (i. e. dynamics of the brane as a classical object in the higher dimensional spacetime) as far as the action of the system has smooth low-curvature limit. We discuss possible solutions to the problem. 
Keiichi Akama