Acoustic black holes get a spin upgrade for superfluid experiments

Acoustic black holes — fluid-flow analogues of gravitational black holes — normally model pure vortex circulation, but real superfluid experiments show solid-body rotation at scales larger than the vortex spacing. By adding a solid-body rotation term to the angular velocity profile, the author derives analytic solutions to the scalar wave equation and extracts quasibound-state spectra for this extended geometry. The results sharpen the theoretical framework for interpreting quantum fluid experiments that probe analogue Hawking physics.