Rotational superradiance with Bogoliubov dispersion

Rotational superradiance affects the dynamics of many rotating systems in nature, through either stimulated or spontaneous extraction energy and angular momentum. By now, this process is well-studied relativistic setting, where are intrinsically dispersion-free. In condensed matter systems, however, dispersion an unavoidable aspect description for short wavelength modes. For these how might one expect to be modified? work, answer question provided using illustrative example. The scattering linear excitations a Bose-Einstein condensate studied presence rotating, draining vortex flow full Bogoliubov relation. It shown that suppresses momentum, firstly, by decreasing superradiant bandwidth, secondly, preventing high-angular momentum modes from superradiating.