Dissipative quantum vortices and superradiant scattering

Inspired by Analogue Gravity, superradiance has been previously investigated in Bose-Einstein condensates (BECs). In this work, we revisit problem introducing dissipation to the system. After establishing possibility of quantum vortices dissipative BECs, analyze propagation elementary excitations, and demonstrate existence superradiant modes, which can be interpreted terms ``antiparticles.'' Our findings support scattering around vortices, they pave way for future experimental realization phenomenon.