Physical Review · 1963 · 157 citations · 1 references
Natural SciencesPhysicsElectromagnetismMathematical PhysicsRelativityElectromagnetic EnergyElectromagnetic WavesGeneral RelativityMagnetic FieldsMagnetohydrodynamicsMaxwell's EquationsCharge ConservationCharge Conservation In RelativityConservation Laws In RelativityEinstein Equations With Matter FieldsEnergy DensityMaxwell's Equations In Differential FormMomentum Of Electromagnetic FieldsStress Tensor
The response of a physical system to external electromagnetic and gravitational fields, as embodied in the electric current and stress tensor conservation laws, is used to derive the equal-time commutation relations for charge density and energy density.
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Non-Abelian Gauge Fields. Relativistic Invariance
Julian Schwinger · Physical Review · 1962 · 255 citations