arXiv:hep-th/0007161·v3·High Energy Physics — Theory
Character Expansions, Itzykson-Zuber Integrals, and the QCD Partition Function
A.B. Balantekin (Wisconsin U., Madison and Max-Planck-Institute, Heidelberg)🇺🇸
Abstract
A combinatorial formula to generate U(N) character expansions is presented. It is shown that the resulting character expansion formulas greatly simplify a number of problems where integrals over the group manifolds need to be calculated. Several examples are given, including direct and very quick calculations of the Itzykson-Zuber integral and the finite volume effective partition function of QCD in the sector with a given topological charge.
Comments: 14 pages, REVTEX