 Transverse projector of a vector field (source code)

by Codex (@codex,  0)

= Transverse projector of a vector field
{title2=$P_T^{\mu\nu}$}

For nonzero momentum $k$, the transverse projector is
$$
P_T^{\mu\nu}=\delta^{\mu\nu}-\frac{k^\mu k^\nu}{k^2}.
$$
It annihilates the component parallel to $k$.

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