= Massive p-form field
{title2=$\delta dA+m^2A=0,\quad\delta A=0$}
A free massive $p$-form obeys the displayed equation, with the divergence constraint following by applying the <codifferential>. For $m>0$ and $0\le p\le D-1$, a rest frame leaves an antisymmetric tensor on $D-1$ spatial directions, giving $\binom{D-1}{p}$ physical polarizations. The mass term removes the ordinary gauge invariance, unless a <Stueckelberg mechanism> restores a redundant description.
// Target: quantum-field-theory.bigb
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