= Massive p-form duality
{title2=$B_{D-p-1}=m^{-1}*dA_p$}
For a free <massive p-form field>, the displayed dual has degree $D-p-1$. The massive field equation reconstructs $A$ locally from $m^{-1}*dB$ with the signature-dependent sign. It also gives $\delta B=0$ and $\delta dB+m^2B=0$. The polarization counts agree because $\binom{D-1}{p}=\binom{D-1}{D-p-1}$. The construction depends on nonzero mass and therefore differs from <massless p-form duality> by one potential rank.
// Target: physics.bigb
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