Putting the Squeeze on Axions

Putting the Squeeze on Axions
AP Photo/Rapid City Journal, Kristina Barker

Sixty years ago Norman Ramsey and collaborators asserted that the neutron's electric dipole moment (EDM)—a measure of the separation of its positive and negative electric charge—was consistent with zero. More precisely, their experiment1 bounded the neutron's EDM at less than 5 × 10−20 e·cm. Today, that limit is 3 × 10−26 e·cm, and experiments under development may push it lower by a factor of 100.

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