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arXiv math-ph/0610049math-phhep-thmath.MP
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正交群和辛群上Harish-Chandra积分的关联函数

Correlation Functions of Harish-Chandra Integrals over the Orthogonal and the Symplectic Groups

A. Prats Ferrer, B. Eynard, P. Di Francesco, J. -B. Zuber

摘要:

哈里什-钱德拉关联函数,即不变单项式的紧群上的积分生成tr{X^{p_1} Omega Y^{q_1} Omega^dagger X^{p_2}.对于正交群和辛群,计算具有权重的exp tr{X Ω Y Ω ^dagger}。我们分两步进行。首先,紧群上的积分被改写为严格上三角复矩阵(具有一些额外的对称性)上的高斯积分,并补充了Weyl群上的求和。这一结果来自于对相关的二矩阵积分中的回路方程的研究,并且可以被看作是我们的关联函数积分的Duistermaat-Heckman定理的适当版本。其次,在三角矩阵上进行高斯积分,得到紧致行列式表达式。

英文摘要:

The Harish-Chandra correlation functions, i.e. integrals over compact groups of invariant monomials prod tr{X^{p_1} Omega Y^{q_1} Omega^dagger X^{p_2} ... with the weight exp tr{X Omega Y Omega^dagger} are computed for the orthogonal and symplectic groups. We proceed in two steps. First, the integral over the compact group is recast into a Gaussian integral over strictly upper triangular complex matrices (with some additional symmetries), supplemented by a summation over the Weyl group. This result follows from the study of loop equations in an associated two-matrix integral and may be viewed as the adequate version of Duistermaat-Heckman's theorem for our correlation function integrals. Secondly, the Gaussian integration over triangular matrices is carried out and leads to compact determinantal expressions.

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