Vacuum polarization

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User:Stannered

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en:Image:Vacuum polarization.png

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https://www.plwiki.pl/b/3f150

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One-loop vacuum polarization diagram. This is the one loop contribution to the photon propagator Π due to vacuum polarization in quantum electrodynamics. It contributes to a wave function renormalization for the photon, leading to a charge screening. It has a logarithmic divergence. Similar one-loop diagrams can be considered for other gauge bosons, such as W, Z and the gluons.

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