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arXiv 2004.11393hep-th
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BPS威尔逊圈和箭袋品种

BPS Wilson loops and quiver varieties

Nadav Drukker

摘要:

三维超对称场论具有保持一组固定超荷的圆形威尔逊圈的大模空间。我们简化了这种威尔逊圈的以前的结构,并修改和澄清其分类。对于一般的规范理论,我们通过适当的对称群将模空间确定为某些$m$的$C^m$的商。这些空间是与原始封面或其子封面相关联的封面变体。这个模空间是一般奇异的,在奇异点处有很大的算子退化,这些算子看起来不同,但它们的期望值和与所有其他规范不变算子的关联函数是相同的。这里提出的公式,其中的威尔逊圈是$S^3$或压扁$S^3_b$也允许直接实现这些观测值,这需要一个间接的上同调等价参数的本地化过程。

英文摘要:

Three dimensional supersymmetric field theories have large moduli spaces of circular Wilson loops preserving a fixed set of supercharges. We simplify previous constructions of such Wilson loops and amend and clarify their classification. For a generic quiver gauge theory we identify the moduli space as a quotient of $C^m$ for some $m$ by an appropriate symmetry group. These spaces are quiver varieties associated to a cover of the original quiver or a subquiver thereof. This moduli space is generically singular and at the singularities there are large degeneracies of operators which seem different, but whose expectation values and correlation functions with all other gauge invariant operators are identical. The formulation presented here, where the Wilson loops are on $S^3$ or squashed $S^3_b$ also allows to directly implement a localization procedure on these observables, which previously required an indirect cohomological equivalence argument.

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