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There may be a still undetermined force between two particle spins over long distances. New study will try to find such UNPARTICLES in magnetized iron under the Earth's surface.
Evidence of a minuscule force that could exist between two particle spins over long distances could be lurking in magnetized iron under the Earth's surface.
That is the conclusion of a new study by physicists in the US, who have used our planet's vast stores of polarized spin to place exacting limits on the existence of interactions mediated by unusual entities such as "unparticles".
That is the conclusion of a new study by physicists in the US, who have used our planet's vast stores of polarized spin to place exacting limits on the existence of interactions mediated by unusual entities such as "unparticles".
The intrinsic angular momentum, or "spin", of a particle gives that particle a magnetic moment, and the interaction between spins generates magnetism.
A ferromagnet, such as iron, becomes magnetized when the spins of some of the electrons in its constituent atoms line up, while quantum mechanics tells us that the magnetic force between spins results from the electrons exchanging "virtual" photons.
Some theoretical physicists have suggested that other, as-yet-undiscovered particles might be exchanged virtually and so give rise to new types of spin–spin interaction.
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