Physicists are interested in them because they have many properties similar to astrophysical black holes and, in particular, emit a phononic version of Hawking radiation.
The surface gravity and temperature of the sonic black hole were measured, but no attempt was made to detect Hawking radiation.
[8] Sonic black holes are possible because phonons in perfect fluids exhibit the same properties of motion as fields, such as gravity, in space and time.
[9] Many nearly perfect fluids have been suggested for use in creating sonic black holes, such as superfluid helium, one–dimensional degenerate Fermi gases, and Bose–Einstein condensate.
Also, measures should be taken to insert a small amount of traditional sound or vibration absorbing materials in the area of very low propagation velocity.