Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-12-15
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages, to appear in the proceedings of the workshop on ``Large N QCD'', ECT* Trento (Italy), 2004; v2 references added
Scientific paper
We review our current understanding of instanton effects in the large N_c limit of QCD. We argue that the instanton liquid can have a smooth large N_c limit which is in agreement with scaling relations derived from Feynman diagrams. We also discuss certain limits of QCD, like the case of high baryon density, in which the Witten-Veneziano relation can be derived from QCD and is saturated by instantons.
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