HEP department seminar by Ronald Kleiss

Monday 12 Apr 2021, 13:30 → 14:30 Europe/Amsterdam

TITLE:                How effective is renormalisation?

Abstract:
In perturbative QFT, renormalisation is performed by eliminating classes of diagrams. It therefore influences the perturbative expansion of all Green's functions. We shall discuss how the asymptotic (i.e. very high order) `improvement' of the perturbation expansion can be computed using techniques of factorially divergent sums. The asymptotic improvement turns out to be completely determined by  the asymptotic behaviour of the vacuum diagrams plus the one-loop counterterms.

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