  Closed string dynamics in the presence of noncommutative Dp-branes is
investigated. In particular, we compute bulk closed string two-point scattering
amplitudes; the bulk space-time geometries encoded in the amplitudes are shown
to be consistent with the recently proposed background space-time geometries
dual to noncommutative Yang-Mills theories. Three-point closed string
absorption/emission amplitudes are obtained to show some features of
noncommutative Dp-branes, such as modified pole structures and exponential
phase factors linearly proportional to the external closed string momentum.
