Gauge-covariant derivative of a charged scalar field (source code)

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= Gauge-covariant derivative of a charged scalar field
{title2=$\mathcal D_a$}

For electric charge $q$ and <electromagnetic four-potential> $A_a$, the derivative $\mathcal D_a=\nabla_a-iqA_a$ transforms covariantly under an electromagnetic <gauge transformation>.

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