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.
Effective mass signatures in multiphoton pair production
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abstract
Electron-positron pair production in oscillating electric fields is investigated in the nonperturbative threshold regime. Accurate numerical solutions of quantum kinetic theory for corresponding observables are presented and analyzed in terms of a proposed model for an effective mass of electrons and positrons acquired within the given strong electric field. Although this effective mass cannot provide an exact description of the collective interaction of a charged particle with the strong field, physical observables are identified which carry direct and sensitive signatures of the effective mass.
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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.