Water circling drain experiments offer insight into black holes
(PHYSorg.com Space & Earth)

A small international team of researchers has found that water waves created due to scattering from a spinning vortex can show rotational superradiance-an effect astrophysicists have predicted likely to occur in black holes, but which has never been replicated in a lab experiment. In their paper published in the journal Nature Physics, the group explains how they observed and measured waves propagating on the surface of water near a draining vortex and what they found.