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arXiv 2112.09705hep-thmath-phmath.MP
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闭式下的精确 Schur 指标

The exact Schur index in closed form

Yiwen Pan, Wolfger Peelaers

AI总结:

针对四维 N=2 超共形场论 Schur 指标难以闭式求值的问题,提出利用被积函数椭圆性的初等方法,将其表示为带 flavor 的 Eisenstein 级数之和,并推导了 class S 等理论的紧凑公式。

摘要:

四维 N = 2 超共形场论的超共形指标的 Schur 极限编码了关于该理论受保护谱的丰富物理信息。对于 Lagrangian 模型,该指标的极限可以通过多元椭圆函数的围道积分来计算。然而,令人惊讶的是,迄今为止它一直未能以封闭的解析形式进行精确求值。在本文中,我们提出了一种初等方法,通过利用被积函数的椭圆性来控制一大类此类积分。我们的结果采用有限项经过充分研究的带 flavor 的 Eisenstein 级数(及其乘积)之和的形式。具体而言,我们推导出了 a1 型 class S 的所有理论的完全带 flavor 的 Schur 指标的紧凑公式,提出了关于规范群为 SU(N) 的所有 N=4 超杨-米尔斯理论的无 flavor 的 Schur 指标的猜想,并给出了其他多种低秩规范理论指标的闭式表达式。我们还讨论了其在非 Lagrangian 理论、模性质以及缺陷指标方面的应用。

英文摘要:

The Schur limit of the superconformal index of a four-dimensional N = 2 superconformal field theory encodes rich physical information about the protected spectrum of the theory. For a Lagrangian model, this limit of the index can be computed by a contour integral of a multivariate elliptic function. However, surprisingly, so far it has eluded exact evaluation in closed, analytical form. In this paper we propose an elementary approach to bring to heel a large class of these integrals by exploiting the ellipticity of their integrand. Our results take the form of a finite sum of (products of) the well-studied flavored Eisenstein series. In particular, we derive a compact formula for the fully flavored Schur index of all theories of class S of type a1, we put forward a conjecture for the unflavored Schur indices of all N=4 super Yang-Mills theories with gauge group SU(N), and we present closed-form expressions for the index of various other gauge theories of low ranks. We also discuss applications to non-Lagrangian theories, modular properties, and defect indices.

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