  In recent papers on Randall-Sundrum D-braneworld model with Z_2 symmetry, it
was shown that the effective gravity does not work as usual, that is, the
gravity does not couple to the gauge field localised on the brane in a usual
way. At first glance there are two possibilities to avoid this serious problem.
One is to remove the Z_2 symmetry and another is to consider a non-BPS state.
In this paper we analyze the Randall-Sundrum D-braneworld model without Z_2
symmetry by long wave approximation. The result is unexpected one, that is, the
gauge field does not couple to the gravity on the brane in the leading order
again. Therefore the remaining possibility to recover the conventional
gravitational theory would be non-BPS cases.
