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The late stages of the relaxation process of a black hole are expected todepend only on its mass and angular momentum and not on the details of itsformation process. Inspired by recent analogue gravity experiments, whichdemonstrate that certain black hole processes take place in gravitational andhydrodynamical systems alike, we conduct an experiment to search forquasinormal mode oscillations of the free surface of a hydrodynamical vortexflow. Our results demonstrate the occurrence and hint at the ubiquity ofquasinormal ringing in nonequilibrium analog black hole experiments.

Quasinormal mode oscillations in an analogue black hole experiment