Do dark matter vortices swirl around black holes?

Fuzzy dark matter — modeled as a quantum Bose-Einstein condensate — can form not just smooth halos around black holes but also stable vortex configurations with quantized angular momentum, like quantum whirlpools. Solving the governing equations across a wide parameter space, the authors map which configurations are stable and which collapse, and find that both ground-state cores and vortices survive under realistic conditions. If such structures form in nature, they could leave distinct imprints on galactic core dynamics and gravitational lensing.