Magnetic 'wormhole' connecting two regions of space created for the first time
Magnetic 'wormhole' connecting two regions of space created for the first time
Date:September 3, 2015
Source:Autonomous University of Barcelona
Summary:"Wormholes" are cosmic tunnels that can connect two distant regions of the universe, and have been popularized by the dissemination of theoretical physics and by works of science fiction like Stargate, Star Trek or, more recently, Interstellar. Using present-day technology it would be impossible to create a gravitational wormhole, as the field would have to be manipulated with huge amounts of gravitational energy, which no one yet knows how to generate. In electromagnetism, however, advances in metamaterials and invisibility have allowed researchers to put forward several designs to achieve this.
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(Left) 3D diagram of the magnetic wormhole, showing how the magnetic field lines (in red) leaving a
magnet on the right pass through the wormhole. (Right) In terms of magnetism the wormhole is
undetectable, which means that the magnetic field seems to disappear on the right only to reappear on
the left in the form of a magnetic monopole.
Credit: Jordi Prat-Camps and Universitat Autònoma de Barcelona
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"Wormholes" are cosmic tunnels that can connect two distant regions of the universe, and have been popularized by the dissemination of theoretical physics and by works of science fiction like Stargate, Star Trek or, more recently, Interstellar. Using present-day technology it would be impossible to create a gravitational wormhole, as the field would have to be manipulated with huge amounts of gravitational energy, which no one yet knows how to generate. In electromagnetism, however, advances in metamaterials and invisibility have allowed researchers to put forward several designs to achieve this.
Scientists in the Department of Physics at the Universitat Autònoma de Barcelona have designed and created in the laboratory the first experimental 'wormhole' that can connect two regions of space magnetically. This consists of a tunnel that transfers the magnetic field from one point to the other while keeping it undetectable -- invisible -- all the way.
The researchers used metamaterials and metasurfaces to build the tunnel experimentally, so that the magnetic field from a source, such as a magnet or a an electromagnet, appears at the other end of the 'wormhole' as an isolated magnetic monopole. This result is strange enough in itself, as magnetic monopoles -- magnets with only one pole, whether north or south -- do not exist in nature. The overall effect is that of a magnetic field that appears to travel from one point to another through a dimension that lies outside the conventional three dimensions.
The 'wormhole' in this experiment is a sphere made of different layers: an external layer with a ferromagnetic surface, a second inner layer, made of superconducting material, and a ferromagnetic sheet rolled into a cylinder that crosses the sphere from one end to the other. The sphere is made in such a way as to be magnetically undetectable -- invisible, in magnetic field terms -- from the exterior.
More:
http://www.sciencedaily.com/releases/2015/09/150903081506.htm
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