Photon vacuum polarization
= Photon vacuum polarization
{title2=$\Pi^{\mu\nu}(k)$}
<Photon vacuum polarization> is the one-particle-irreducible <photon> <two-point function> generated by charged-particle loops.
= Photon vacuum polarization
{title2=$\Pi^{\mu\nu}(k)$}
<Photon vacuum polarization> is the one-particle-irreducible <photon> <two-point function> generated by charged-particle loops.