Titlebook: Advanced Concepts in Quantum Field Theory; With Exercises James M. Cline Book 2020 The Author(s), under exclusive license to Springer Natur

只看該作者 · 發(fā)表于 2025-3-25 23:04:53

Christoph Burmann,Julia LaunspachThe momentum space cutoff we have been using is the most intuitive form of regularization, but it is not the most efficient one. For a scalar field theory which does not have any gauge symmetries to preserve it is fine. But in a gauge theory, the momentum space cutoff is bad news.

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B S Johnson and Post-War LiteratureSometimes a symmetry which seems to be present in a theory at the classical level can be spoiled by quantum (loop) effects. We have already seen such an example without knowing it.

只看該作者 · 發(fā)表于 2025-3-26 09:28:29

B. Traven – Die unbekannten JahreWe have dealt with the simplest kind of gauge theory, which is based on the gauge symmetry .(1). It is an Abelian group because any two .(1) transformations commute with each other:

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