  We derive the low energy effective action for the dilatonic braneworld. In
the case of the single-brane model, we find the effective theory is described
by the Einstein-scalar theory coupled to the dark radiation. Remarkably, the
dark radiation is not conserved in general due to a coupling to the bulk scalar
field. The effective action incorporating Kaluza-Klein (KK) corrections is
obtained and the role of the AdS/CFT correspondence in the dilatonic braneworld
is revealed. In particular, it is shown that CFT matter would not be confined
to the braneworld in the presence of the bulk scalar field. The relation
between our analysis and the geometrical projection method is also clarified.
In the case of the two-brane model, the effective theory reduces to a
scalar-tensor theory with a non-trivial coupling between the radion and the
bulk scalar field.
