Tau.Neutrino said:
Physicists Observe Backreaction in Analogue Black Hole Experiment
Physicists from the University of Nottingham and the University of Cambridge have for the first time demonstrated that the evolution of black holes resulting from the fields surrounding them can be simulated in a lab experiment. Their results are published in the journal Physical Review Letters.
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> used a water tank simulator consisting of a draining vortex, like the one that forms when we pull the plug in the bath. This mimics a black hole since a wave which comes too close to the drain gets dragged down the plug hole, unable to escape. Systems like these have grown increasingly popular over the past decade as a means to test gravitational phenomena in a controlled laboratory environment. In particular, Hawking radiation has been observed in an analogue black hole experiment involving quantum optics.
> Using this technique, the researchers showed for the first time that when waves are sent into an analogue black hole, the properties of the black hole itself can change significantly. The mechanism underlying this effect in their particular experiment has a remarkably simple explanation.
> When waves come close to the drain, they effectively push more water down the plug hole causing the total amount of water contained in the tank to decrease. This results in a change in the water height, which in the simulation corresponds to a change in the properties of the black hole.
:-)
Or should I say LOL?
One problem I see is that a vortex swirling down a plughole is a rotating black hole, a Kerr black hole, and a Kerr black hole has a quite strange interior structure. The plughole diameter would have to change in real time in order to correctly mimic changes in angular momentum. Also, water pressure is a problem because it’s much bigger relative to kinematic factors for water than the back pressure of matter falling into a black hole; having a vortex made of air would be more realistic.