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arXiv 1407.8341hep-thmath-phmath.MP
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Nekrasov-Shatashvili极限下的球面Hecke代数

Spherical Hecke algebra in the Nekrasov-Shatashvili limit

Jean-Emile Bourgine

摘要:

球形Hecke中心(SHc)代数已经被证明作用于$\mathcal{N}=2$规范理论的Nekrasov瞬子配分函数。它的存在占可积性和AGT对应。另一方面,由Nekrasov和Shatashvili(NS)引入的Omega背景的特定限制导致TBA和Bethe方程的出现。为了统一这两种观点,我们研究了SHc代数的NS极限。我们提供了一个表达的瞬子配分函数的Bethe根,并定义了一组运营商,产生无穷小的变化的根源。这些算子服从在等变参数$ε_2$中定义一阶SHc代数的交换关系。此外,他们对双基本贡献的作用再现了Kanno-Matsuo-Zhang变换。我们还讨论了与迈耶集群扩展的方法,导致TBA类方程的连接。

英文摘要:

The Spherical Hecke central (SHc) algebra has been shown to act on the Nekrasov instanton partition functions of $\mathcal{N}=2$ gauge theories. Its presence accounts for both integrability and AGT correspondence. On the other hand, a specific limit of the Omega background, introduced by Nekrasov and Shatashvili (NS), leads to the appearance of TBA and Bethe like equations. To unify these two points of view, we study the NS limit of the SHc algebra. We provide an expression of the instanton partition function in terms of Bethe roots, and define a set of operators that generates infinitesimal variations of the roots. These operators obey the commutation relations defining the SHc algebra at first order in the equivariant parameter $ε_2$. Furthermore, their action on the bifundamental contributions reproduces the Kanno-Matsuo-Zhang transformation. We also discuss the connections with the Mayer cluster expansion approach that leads to TBA-like equations.

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