  We study in detail the scalar-field Hawking radiation emitted into the bulk
by a higher-dimensional, rotating black hole. We numerically compute the
angular eigenvalues, and solve the radial equation of motion in order to find
transmission factors. The latter are found to be enhanced by the angular
momentum of the black hole, and to exhibit the well-known effect of
superradiance. The corresponding power spectra for scalar fields show an
enhancement with the number of dimensions, as in the non-rotating case. We
compute the total mass loss rate of the black hole for a variety of black-hole
angular momenta and bulk dimensions, and find that, in all cases, the bulk
emission remains significantly smaller than the brane emission. The
angular-momentum loss rate is also computed and found to have a smaller value
in the bulk than on the brane. We present accurate bulk-to-brane emission
ratios for a range of scenarios.
