Line defect Schur indices, Verlinde algebras and U(1)r fixed points

Line defect Schur indices, Verlinde algebras and U(1)r fixed points
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线缺陷 Schur 指数、Verlinde 代数和 U(1)r 不动点

DOI:
10.1007/jhep11(2017)035
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发表时间:
2017
影响因子:
5.4
通讯作者:
Yan, Fei
Yan, Fei
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Neitzke, Andrew;Yan, Fei

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在给定超共形场论的条件下,我们重新考虑了半线亏损L存在时的Schur指数ψ L(q)。最近,Cordova-Gaiotto-Shao发现了BRL(q)可以用Beem等人引入的手征代数的特征标展开,具有简单系数<$L,β(q)。我们报道了这个展开式的一个令人困惑的新特征:在S1上紧化的理论的U(1)r-不变真空中,系数ε L,β(q)的q→ 1极限与真空期望值线性相关< L>.这个关系可以用代数表示为一个涉及三个代数的交换图:由线亏生成的代数,U(1)r-不变真空上的函数代数,以及与相关的Verlindelike代数。我们的证据是实验性的,通过在(A1,A2),(A1,A4),(A1,A6),(A1,D3)和(A1,D5)型阿盖尔-道格拉斯理论中的直接计算。在后两个理论中,这两个理论具有味对称性,出现的Verlinde-like代数是以前考虑过的代数的新变形。
Given ansuperconformal field theory, we reconsider the Schur index ℐ L (q) in the presence of a half line defect L. Recently Cordova-Gaiotto-Shao found that ℐ L (q) admits an expansion in terms of characters of the chiral algebraintroduced by Beem et al., with simple coefficients υ L, β (q). We report a puzzling new feature of this expansion: the q→ 1 limit of the coefficients υ L, β (q) is linearly related to the vacuum expectation values< L> in U (1) r-invariant vacua of the theory compactified on S 1. This relation can be expressed algebraically as a commutative diagram involving three algebras: the algebra generated by line defects, the algebra of functions on U (1) r-invariant vacua, and a Verlindelike algebra associated to. Our evidence is experimental, by direct computation in the Argyres-Douglas theories of type (A 1, A 2),(A 1, A 4),(A 1, A 6),(A 1, D 3) and (A 1, D 5). In the latter two theories, which have flavor symmetries, the Verlinde-like algebra which appears is a new deformation of algebras previously considered.
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