Calculating loop corrections for g − 2 in an external magnetic field suggests strong limits on axion coupling.
A bstract We consider the effects of a local axion dark matter background on g − 2 of the electron. We calculate loop corrections to the photon-electron vertex and determine analytical formulas for the spin and cyclotron frequencies when the electron is in an external magnetic field. By comparing with current measurements of these observables, we are able to place the strongest constraint on the axion-elecron coupling for axion masses below 3 × 10 − 18 eV.
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Arza et al. (2025) studied this question.
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