Integration with respect to the Haar measure on unitary, orthogonal and symplectic group

Details Integration with respect to the Haar measure on unitary, orthogonal and symplectic group Integration with respect to the Haar measure on unitary, orthogonal and symplectic group

2004-02-26

arxiv.org/abs/math-ph/0402073v1

Commun. Math. Phys. 264 (2006), 773--795

Physics

Mathematical Physics

Scientific paper

10.1007/s00220-006-1554-3

We revisit the work of the first named author and using simpler algebraic arguments we calculate integrals of polynomial functions with respect to the Haar measure on the unitary group U(d). The previous result provided exact formulas only for 2d bigger than the degree of the integrated polynomial and we show that these formulas remain valid for all values of d. Also, we consider the integrals of polynomial functions on the orthogonal group O(d) and the symplectic group Sp(d). We obtain an exact character expansion and the asymptotic behavior for large d. Thus we can show the asymptotic freeness of Haar-distributed orthogonal and symplectic random matrices, as well as the convergence of integrals of the Itzykson-Zuber type.

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