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arXiv 1504.06308hep-th
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双球面上的等变A-扭曲和规范线性西格玛模型

The equivariant A-twist and gauged linear sigma models on the two-sphere

Cyril Closset, Stefano Cremonesi, Daniel S. Park

摘要:

本文研究了二维$\mathcal{N}=(2,2)$超对称规范线性西格玛模型(GLSM)在$Ω$变形球$S^2_Ω$(它是$A$扭曲球的单参数变形)上的性质.我们利用超对称局域化方法给出了$S^2_Ω$超对称关联函数的精确公式。每个瞬子扇区的贡献是根据库仑分支上的Jeffrey-Kirwan剩余给出的。在$Ω$ -形变为零的极限下,该局部化公式大大简化了$A$ -扭曲关联函数的计算,并为非阿贝尔理论提供了新的结果.我们讨论了一些例子和评论的$ε_Ω$ -变形的量子上同调关系。最后,在阿贝尔规范群的特殊情况下,我们提出了一个互补的希格斯分支局域化方案。

英文摘要:

We study two-dimensional $\mathcal{N}=(2,2)$ supersymmetric gauged linear sigma models (GLSM) on the $Ω$-deformed sphere, $S^2_Ω$, which is a one-parameter deformation of the $A$-twisted sphere. We provide an exact formula for the $S^2_Ω$ supersymmetric correlation functions using supersymmetric localization. The contribution of each instanton sector is given in terms of a Jeffrey-Kirwan residue on the Coulomb branch. In the limit of vanishing $Ω$-deformation, the localization formula greatly simplifies the computation of $A$-twisted correlation functions, and leads to new results for non-abelian theories. We discuss a number of examples and comment on the $ε_Ω$-deformation of the quantum cohomology relations. Finally, we present a complementary Higgs branch localization scheme in the special case of abelian gauge groups.

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