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The long-range spin-spin interaction.

Illustration showing earth with a yellow core and arrows showing direction of a fifth force

The long-range spin-spin interaction (blue wavy lines) in which the spin-sensitive detector on Earths surface interacts with geoelectrons (red dots) deep in Earths mantle. The arrows on the geoelectrons indicate their spin orientations, opposite that of Earths magnetic field lines (white arcs). Illustration: Marc Airhart (University of Texas at Austin) and Steve Jacobsen (Northwestern University).

Credit: Marc Airhart, University of Texas at Austin, and Steve Jacobsen, Northwestern University.

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