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arXiv 1011.4491hep-th
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关于β-系综的带曲面算子插入的AGT关系及平稳极限

On AGT Relations with Surface Operator Insertion and Stationary Limit of Beta-Ensembles

A. Marshakov, A. Mironov, A. Morozov

摘要:

我们提出了一个总结目前的知识AGT关系的共形块的额外插入的最简单的退化算子,和一个特殊的选择相应的中间尺寸,当共形块满足超几何型微分方程的退化算子的位置。一个特别注意的是专门用于表示共形块通过β系综预解式和其渐近的限制大尺寸(外部和中间)采取不对称的变形ε参数。渐近中的次主导项定义了单参数变形塞伯格-威滕前势(其完全双参数变形导致Nekrasov函数)的玻尔-索末菲表示中的生成微分。这个生成微分也被证明是相应的β系综的单点预解式的单参数版本,并且其在规范理论微扰极限中的周期通过Harish-Chandra函数的比率来表示。前面讨论过的薛定谔/巴克斯特方程直接由退化共形块的微分方程推导而来。这为评价单变形前势,甚至Seiberg-Witten前势本身提供了一种强有力的方法。我们主要讨论球面上四点块和环面上一点块的插入问题。

英文摘要:

We present a summary of current knowledge about the AGT relations for conformal blocks with additional insertion of the simplest degenerate operator, and a special choice of the corresponding intermediate dimension, when the conformal blocks satisfy hypergeometric-type differential equations in position of the degenerate operator. A special attention is devoted to representation of conformal block through the beta-ensemble resolvents and to its asymptotics in the limit of large dimensions (both external and intermediate) taken asymmetrically in terms of the deformation epsilon-parameters. The next-to-leading term in the asymptotics defines the generating differential in the Bohr-Sommerfeld representation of the one-parameter deformed Seiberg-Witten prepotentials (whose full two-parameter deformation leads to Nekrasov functions). This generating differential is also shown to be the one-parameter version of the single-point resolvent for the corresponding beta-ensemble, and its periods in the perturbative limit of the gauge theory are expressed through the ratios of the Harish-Chandra function. The Shrödinger/Baxter equations, considered earlier in this context, directly follow from the differential equations for the degenerate conformal block. This provides a powerful method for evaluation of the single-deformed prepotentials, and even for the Seiberg-Witten prepotentials themselves. We mostly concentrate on the representative case of the insertion into the four-point block on sphere and one-point block on torus.

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