Scientists have created a giant quantum tornado inside a helium superfluid, and they want to use it to probe the enigmatic nature of black holes.
The whirlpool made from liquid helium cooled to near absolute zero moves without friction, making it mimic the way rotating black holes warp the space-time that surrounds them.
By studying the vortex, physicists could glean important insight into the behavior of the cosmic monsters. The researchers published their findings March 20 in the journal Nature.
"Using superfluid helium has allowed us to study tiny surface waves in greater detail and accuracy than with our previous experiments in water," lead author Patrik Svancara, a physicist at the University of Nottingham in the U.K., said in a statement. "As the viscosity of superfluid helium is extremely small, we were able to meticulously investigate their interaction with the superfluid tornado and compare the findings with our own theoretical projections."
Related: Supermassive black hole at the heart of the Milky Way is approaching the cosmic speed limit, dragging space-time along with it
The workings of black holes remain a persistent mystery for physicists. The known laws of physics break in the presence of these extreme objects' infinite gravitational pulls. For those looking to combine Einstein's theory of general relativity with quantum mechanics, this means black holes' warping of space-time offers an alluring pull.
In the absence of a cataclysmic space-time rupture on Earth, the team behind the new study looked to a model system that could simulate some of the extreme eddies that exist around black holes. After supercooling liquid helium to a few fractions above absolute zero, they placed it inside a tank with a propeller at the bottom to stir up a vortex inside the fluid.
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Then, by watching how the superfluid (which flows roughly 500 times more easily than water) moved, the researchers observed how thousands of tiny vortices inside it combined into a giant whirlpool.
"Superfluid helium contains tiny objects called quantum vortices, which tend to spread apart from each other," Svancara said in the statement. "In our set-up, we've managed to confine tens of thousands of these quanta in a compact object resembling a small tornado, achieving a vortex flow with record-breaking strength in the realm of quantum fluids."
By studying the quantum whirlpool, the scientists found convincing similarities to how black holes behave in space. Most notably, they observed a similar black hole phenomenon called ringdown, which is when a newly merged black hole wobbles on its axis.
Now that the simpler parallels have been observed, the researchers will train their experiment on more mysterious aspects of black hole behavior.
This "could eventually lead us to predict how quantum fields behave in curved spacetimes around astrophysical black holes," co-author Silke Weinfurtner, a professor of physics at the University of Nottingham, said in the statement.
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