Each continuous symmetry φ → φ + ε δφ of the action yields a conserved current j^μ with ∂_μ j^μ = 0 and conserved charge Q = ∫ j⁰ d³x.
Each continuous symmetry φ → φ + ε δφ of the action yields a conserved current j^μ with ∂_μ j^μ = 0 and conserved charge Q = ∫ j⁰ d³x.