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arXiv 2510.19682hep-thmath.DG
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M5膜在ADE奇点上的行为:BPS谱和分区函数

M5 branes on ADE singularities: BPS spectrum and partition functions

Bethe Center for Theoretical Physics, Universität Bonn(波恩大学贝特理论物理中心)

Daniele Ceppi, Guglielmo Lockhart

AI总结:

研究M5膜在ADE奇点上所描述的超共形场论的BPS谱及分区函数,通过计算不同子群下的分区函数,揭示BPS弦和粒子的贡献。

摘要:

一个堆栈的M5膜探测横切的多中心Taub-NUT空间的动力学由一类称为M弦轨道展开超对称场论的6d $\mathcal{N}=(1,0)$超共形场论描述。我们确定了此类理论在几何背景类型$T^2\times\mathbb{C}^2/Γ$上的等变分区函数,其中$Γ\in\{\mathcal{C}_N,\mathcal{Q}_N, \mathcal{T},\mathcal{O},\mathcal{I}\}$是任意有限子群。这些分区函数由BPS弦和将6d理论放在圆上所得到的BPS粒子的贡献组成。我们发现BPS粒子的贡献可以表示为Γ-协变希尔伯特级数,这些级数计数向量包上奇点的全纯截面,其单值性由Γ的不可约表示指定。另一方面,BPS弦的贡献由2d $\mathcal{N}=(0,4)$ Γ-装饰有向图超对称场论的椭圆生成函数给出,这些场论由在支持电流代数的界面之间堆叠Kronheimer-Nakajima有向图得到。我们获得了任意BPS弦配置的椭圆生成函数的显式表达式,对应于$\mathbb{C}^2/Γ$上的分数瞬子弦。对于星型有向图类型$Γ\in\{\mathcal{Q}_4,\mathcal{T},\mathcal{O},\mathcal{I}\}$的情况,我们给出了通过粘合2d类比的Gaiotto和Witten的$T[SU(N)]$理论来计算椭圆生成函数的程序。

英文摘要:

The dynamics of a stack of M5 branes probing a transverse multi-centered Taub-NUT space are described by a class of 6d $\mathcal{N}=(1,0)$ superconformal field theories known as the M-string orbifold SCFTs. We determine the equivariant partition functions for this class of theories on a geometric background of type $T^2\times\mathbb{C}^2/Γ$, where $Γ\in\{\mathcal{C}_N,\mathcal{Q}_N, \mathcal{T},\mathcal{O},\mathcal{I}\}$ is an arbitrary finite subgroup of $SU(2)$. The partition functions are built out of contributions from BPS strings as well as BPS particles that arise upon putting the 6d theory on a circle. We find that BPS particle contributions can be expressed in terms of $Γ$-covariant Hilbert series which count holomorphic sections of vector bundles on the orbifold singularity with monodromy specified by an irreducible representation of $Γ$. The BPS string contributions, on the other hand, are given by the elliptic genera of 2d $\mathcal{N}=(0,4)$ $Γ$-dressed quiver gauge theories, obtained by stacking Kronheimer-Nakajima quivers of type $Γ$ between interfaces that support current algebras for the McKay dual affine Lie algebra $\widehat{\mathfrak{g}}$. We obtain explicit expressions for the elliptic genera of arbitrary BPS string configurations corresponding to fractional instanton strings on $\mathbb{C}^2/Γ$, and for the case of star-shaped quivers of type $Γ\in\{\mathcal{Q}_4,\mathcal{T},\mathcal{O},\mathcal{I}\}$ we give a prescription to compute the elliptic genera by gluing 2d analogues of Gaiotto and Witten's $T[SU(N)]$ theories.

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