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Closset, Cyril; Cremonesi, Stefano; Park, Daniel S.
The journal of high energy physics, 06/2015, Letnik: 2015, Številka: 6Journal Article
A bstract We study two-dimensional N = 2 , 2 supersymmetric gauged linear sigma models (GLSM) on the Ω-deformed sphere, S Ω 2 , which is a one-parameter deformation of the A -twisted sphere. We provide an exact formula for the S Ω 2 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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