Second-order shifts of electron mass and spin-precession frequencies from oscillating ultralight dark matter exist only for DM masses above the experimental frequency scale, making g-2 constraints much weaker than previously claimed.
Electron $g-2$ corrections from axion dark matter
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We consider the effects of a local axion dark matter background on the $g-2$ 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 $3\times10^{-18}\text{eV}$.
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Ponderomotive Effects of Ultralight Dark Matter
Second-order shifts of electron mass and spin-precession frequencies from oscillating ultralight dark matter exist only for DM masses above the experimental frequency scale, making g-2 constraints much weaker than previously claimed.