Due to the nonlinearity of QED, a static charge becomes a magnetic dipole if placed in a magnetic field, and a magnetic monopole on the background is a combination of constant electric and magnetic fields. Already without external field, the cubic Maxwell equation for the field of a point charge has a soliton solution with a finite field energy and finite potential, the energy-momentum vector of a moving soliton being the same as that of a point massive particle. Equations are given for self-coupling dipole moments. Any theoretically found value for a multipole moment of a baryon or a meson should be subjected to nonlinear renormalization.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 11, pp. 45–54, November, 2016.
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Adorno, T.C., Gitman, D.M., Shabad, A.E. et al. Quantum Electromagnetic Nonlinearity Affecting Charges and Dipole Moments. Russ Phys J 59, 1775–1787 (2017). https://doi.org/10.1007/s11182-017-0976-z
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DOI: https://doi.org/10.1007/s11182-017-0976-z