Scientists have created an artificial black hole for sound waves

Many things that exist in the Universe cannot be touched by hands or at least seen, even in the form of indicators on devices. But you can find analogs that behave in some cases in a similar way, and use their example to show the work of physical laws.

One of the latest interesting developments in this area is the "fake wormhole" for acoustic waves. The fact is that the behavior of a wave passing through an optical system is identical to the behavior of an object moving in curved space. A wormhole is an example of such a curvature, it is widely described in science and science fiction literature. And for clarity, the scientists went for a trick and made its analogue.

They took advantage of a loophole: waves propagate in a two-dimensional plane, through the thickness of matter, but we live in a three-dimensional world! Therefore, the researchers 3D printed a kind of flat funnel, almost a plate with a hole and minimal bending, then another, and connected the edges of the holes with a short tube. Here it is, a real wormhole for those who live in a two-dimensional world! Let's imagine that a wave is running along the surface of the plate. When it reaches the hole, it will "dive" there - we will notice a weak residual effect due to the slight curvature, but in fact the wave will disappear from this plate.

Further, this wave will emerge on another plate, for observers there - out of nowhere. For them, this wave, and what it carries with it, will literally come from another world. Now try replacing two-dimensional space with three-dimensional and you will understand how this should work in our real world. And while astrophysicists have yet to find real wormholes, any physics student can already make a desktop copy for themselves to impress their friends.