Im looking for a good resource that clearly explains the problem of Gribov ambiguity. In particular, I want to know(adsbygoogle = window.adsbygoogle || []).push({});

1. Why the problem only arises for non-abelian theories

2. Why restricting the functional integration to field configurations where the Faddeev-popov determinant is postive solves the problem for perturbative theories

3. Why this doesnt work for non-perturbative theories

Thanks in advance

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# Gribov copies

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