Results from an experiment designed to test the limits of charge–parity (CP) symmetry have been used to restrict the possible mass range of a candidate dark-matter particle. Writing in Physical Review X, researchers with the international Neutron Electric Dipole Moment (nEDM) collaboration report that the absence of oscillations in the electric dipole moment of ultracold neutrons and mercury-199 atoms rules out axion-like dark-matter particles with masses between 10-24 and 10-17 eV.
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