Axial-gauge propagator
= Axial-gauge propagator
{title2=$D_{\mu\nu}(k;n)$}
In strict <axial gauge>, the <gauge-boson propagator> obeys $n^\mu D_{\mu\nu}(k)=0$ and contains poles at $n\cdot k=0$. Its contraction with conserved external currents removes the gauge-choice terms. Consistent calculations require an <axial-gauge pole prescription>.