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.
The intensity dependent mass shift: existence, universality and detection
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The electron mass shift in a laser field has long remained an elusive concept. We show that the mass shift can exist in pulses but that it is neither unique nor universal: it can be reduced by pulse shaping. We show also that the detection of mass shift effects in laser-particle scattering experiments is feasible with current technology, even allowing for the transverse structure of realistic beams.
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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.