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arXiv 1003.2929hep-th
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用β变形矩阵模型生成共形块和N=2 Nekrasov函数的q展开系数的方法

Method of Generating q-Expansion Coefficients for Conformal Block and N=2 Nekrasov Function by beta-Deformed Matrix Model

Hiroshi Itoyama, Takeshi Oota

摘要:

我们观察到,在四点共形块的β变形矩阵模型中,点q=0是三Penner型模型变成一对解耦的二Penner型模型的点,并且在平面极限中,二切割特征值分布(阵列)合并成一切割特征值分布(阵列)。本文将Dotsenko-Fateev重积分及其路径作为扰动双Selberg矩阵模型(在q=0时,它变成一对Selberg积分),构造了两种q展开系数的母函数,并计算了一些.注意到与杰克多项式相关联的公式。导出了Nf =4时SU(2)的第二Nekrasov系数。一对Young图自然出现。精确求解了q=0时的有限N回路方程及其平面极限,为求解方程的系数提供了一个有用的工具。在q-展开的平面自由能计算到最低的非平凡阶。给出了Nekrasov函数的自由场表示。

英文摘要:

We observe that, at beta-deformed matrix models for the four-point conformal block, the point q=0 is the point where the three-Penner type model becomes a pair of decoupled two-Penner type models and where, in the planar limit, (an array of) two-cut eigenvalue distribution(s) coalesce into (that of) one-cut one(s). We treat the Dotsenko-Fateev multiple integral, with their paths under the recent discussion, as perturbed double-Selberg matrix model (at q=0, it becomes a pair of Selberg integrals) to construct two kinds of generating functions for the q-expansion coefficients and compute some. A formula associated with the Jack polynomial is noted. The second Nekrasov coefficient for SU(2) with N_f =4 is derived. A pair of Young diagrams appears naturally. The finite N loop equation at q=0 as well as its planar limit is solved exactly, providing a useful tool to evaluate the coefficients as those of the resolvents. The planar free energy in the q-expansion is computed to the lowest non-trivial order. A free field representation of the Nekrasov function is given.

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