Instantons and the large N_c limit, A.D. 2004

Abstract

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.

18 pages, to appear in the proceedings of the workshop on ``Large N QCD'', ECT* Trento (Italy), 2004; v2 references added

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• Topological susceptibility, divergent chiral density and phase diagram of chirally imbalanced QCD medium at finite temperature
• QCD condensates in ADS/QCD