Four-momentum of the field of a point charge in nonlinear electrodynamics
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We prove that the four-momentum of the electromagnetic field of a point charge is a four-vector if the field Lagrangian is nonlinear (with respect to field invariants) and the field mass is finite. We define the class of Lagrangians leading to a bound on the field mass.
Keywordsnonlinear electrodynamics point charge field mass field four-momentum
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