Is there a reason that one-loop corrections to vertex functions seem to always be logarithmic?(adsbygoogle = window.adsbygoogle || []).push({});

If you write the vertex as a Taylor series in the external momenta, then the first couple of terms (say the constant and linear terms) diverge, but these divergence gets subtracted off, so you now have a Taylor series minus the first couple of terms, and this Taylor series is a log?

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# Renormalized vertex always a log?

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