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arXiv 1012.1355hep-thmath.AGmath.RT
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N=2 SU(N)规范理论中的瞬子配分函数及其W-代数

Instanton partition functions in N=2 SU(N) gauge theories with a general surface operator, and their W-algebra duals

Niclas Wyllard

摘要:

本文给出了一个关于4dN =2 SU(N)规范理论中存在某种表面算符时瞬子配分函数的猜想.这些曲面算子通过N的分区来分类,并且对于每个分区,存在相关联的配分函数。对于划分N=N,我们恢复Nekrasov形式主义,当N=1+.+ 1我们重现了Feigin et.对于N=1+(N-1)的情形,我们的表达式与另一个用限制SU(N)xSU(N)瞬子配分函数表示的公式是一致的.当N=1+...+ 1+2的配分函数也可以从某些称为拟超共形代数的W-代数中微扰地得到,这与最近的一个一般性建议一致。

英文摘要:

We write down an explicit conjecture for the instanton partition functions in 4d N=2 SU(N) gauge theories in the presence of a certain type of surface operator. These surface operators are classified by partitions of N, and for each partition there is an associated partition function. For the partition N=N we recover the Nekrasov formalism, and when N=1+...+1 we reproduce the result of Feigin et. al. For the case N=1+(N-1) our expression is consistent with an alternative formulation in terms of a restricted SU(N)xSU(N) instanton partition function. When N=1+...+1+2 the partition functions can also be obtained perturbatively from certain W-algebras known as quasi-superconformal algebras, in agreement with a recent general proposal.

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