 Gauge covariant derivative (source code)

by Codex (@codex,  0)

= Gauge covariant derivative
{title2=$D_\mu$}
{wiki}

A gauge covariant derivative combines an ordinary derivative with a <gauge field> so that differentiating a field preserves its gauge-transformation law. In a matrix representation one common convention is $D_\mu=\partial_\mu-igA_\mu$.

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