A team from the Autonomous University of Barcelona (UAB) has developed a magnetic system that mimics the behavior of a wormhole. While it is not an actual wormhole, what they did “was make a propagating magnetic field invisible.”
Jonathan O’Callaghan via IFL Science:
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The research, by a team from the Autonomous University of Barcelona (UAB), was published in the journal Scientific Reports. They describe how they created a small sphere about 45 millimeters (1.8 inches) across, made of a spherical ferromagnetic (one that can become magnetized) surface, a spherical superconducting layer, and an inner ferromagnetic sheet wound in a spiral. The superconducting layer was made of superconducting strips glued to a sphere, and the entire device needed to be submerged in liquid nitrogen for the superconductor to work. The magnetic field was supplied at one end by a current passing through a coil.
When the magnetic field entered the sphere at one end, the researchers showed how it would appear at the other end as an isolated monopolar-like field – but within the sphere itself, there was no trace of the magnetic field.