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arXiv 1012.3137hep-th
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β = 1时AGT猜想的一个直接证明

A direct proof of AGT conjecture at beta = 1

A. Mironov, A. Morozov, Sh. Shakirov

摘要:

AGT猜想要求二维CFT中的共形块与Nekrasov函数和(四维SUSY规范理论中的瞬子和)等价。共形块可以表示为Dotsenko-Fateev β-系综,因此,AGT猜想暗示了Dotsenko-Fateev β-系综与Nekrasov函数之间的相等性。本文在β =1的特殊情况下(在共形侧对应于c = 1,在规范理论侧对应于ε_1 + ε_2 = 0),用非常直接的方法证明了它。中心的作用是发挥代表性的Nekrasov功能,通过的字符(舒尔多项式)的Selberg矩阵模型。我们主要集中在SU(2)的情况下,4个基本面,扩展到其他情况是直接的。最晦涩的部分是扩展到任意的beta:对于beta \neq 1,我们使用的Selberg积分不能再现单个Nekrasov函数,而只能再现它们的和。

英文摘要:

The AGT conjecture claims an equivalence of conformal blocks in 2d CFT and sums of Nekrasov functions (instantonic sums in 4d SUSY gauge theory). The conformal blocks can be presented as Dotsenko-Fateev beta-ensembles, hence, the AGT conjecture implies the equality between Dotsenko-Fateev beta-ensembles and the Nekrasov functions. In this paper, we prove it in a particular case of beta=1 (which corresponds to c = 1 at the conformal side and to epsilon_1 + epsilon_2 = 0 at the gauge theory side) in a very direct way. The central role is played by representation of the Nekrasov functions through correlators of characters (Schur polynomials) in the Selberg matrix models. We mostly concentrate on the case of SU(2) with 4 fundamentals, the extension to other cases being straightforward. The most obscure part is extending to an arbitrary beta: for beta \neq 1, the Selberg integrals that we use do not reproduce single Nekrasov functions, but only sums of them.

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