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arXiv 1801.04542hep-thmath-phmath.MP
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4d $\mathcal{N}=2$ SCFT的几何分类

Geometric classification of 4d $\mathcal{N}=2$ SCFTs

Matteo Caorsi, Sergio Cecotti

摘要:

4d $\mathcal{N}=2$ SCFT的分类归结为具有闭合Reeb轨道(CSG)的锥形特殊几何形状的分类。在温和的假设下,证明了CSG的基础复空间是一个具有Hodge数$h^{p,q}=δ_{p,q}$的单连通$\mathbb{Q}$ -阶乘log-Fano簇上的仿射锥。在一些合理的限制下,这意味着库仑支手征环$\mathscr{R}$是由维数为$Δ_i$的整体全纯函数$u_i$生成的分次多项式环. CSG的粗粒度分类包括列出(多个)维$k$ -元组$\{Δ_1,Δ_2,\cdots,Δ_k\}$,这些元组被实现为某些秩$k$ CSG的库仑分支维:这是我们在本文中解决的问题。我们的层理论分析导致了可能的$\{Δ_1,\cdots,Δ_k\}$的通用维数公式。对于拉格朗日SCFT,普适公式简化为施普林格理论的基本定理。秩$k$中允许的维数$\boldsymbol{N}(k)$由Erdös-Bateman数论函数的某个和给出(OEIS中的序列A070243),因此对于大的$k$ $$ \boldsymbol{N}(k)=\frac{2\,ζ(2)\,ζ(3)}{ζ(6)}\,k^2+o(k^2). $$,在特殊情况下,我们的维数公式再现了Argyres等人最近的结果。类场论暗示了一个微妙之处:某些维度$k$ -元组$\{Δ_1,\cdots,Δ_k\}$只有在被关于电磁电荷的附加选择规则补充时才是一致的,即,对于具有这些库仑维度的SCFT,并非所有与狄拉克量子化一致的电荷/通量都是允许的。我们用几个例子来说明各个方面,并执行一些明确的检查。我们包括了前几个$k$的尺寸表。

英文摘要:

The classification of 4d $\mathcal{N}=2$ SCFTs boils down to the classification of conical special geometries with closed Reeb orbits (CSG). Under mild assumptions, one shows that the underlying complex space of a CSG is (birational to) an affine cone over a simply-connected $\mathbb{Q}$-factorial log-Fano variety with Hodge numbers $h^{p,q}=δ_{p,q}$. With some plausible restrictions, this means that the Coulomb branch chiral ring $\mathscr{R}$ is a graded polynomial ring generated by global holomorphic functions $u_i$ of dimension $Δ_i$. The coarse-grained classification of the CSG consists in listing the (finitely many) dimension $k$-tuples $\{Δ_1,Δ_2,\cdots,Δ_k\}$ which are realized as Coulomb branch dimensions of some rank-$k$ CSG: this is the problem we address in this paper. Our sheaf-theoretical analysis leads to an Universal Dimension Formula for the possible $\{Δ_1,\cdots,Δ_k\}$'s. For Lagrangian SCFTs the Universal Formula reduces to the fundamental theorem of Springer Theory. The number $\boldsymbol{N}(k)$ of dimensions allowed in rank $k$ is given by a certain sum of the Erdös-Bateman Number-Theoretic function (sequence A070243 in OEIS) so that for large $k$ $$ \boldsymbol{N}(k)=\frac{2\,ζ(2)\,ζ(3)}{ζ(6)}\,k^2+o(k^2). $$ In the special case $k=2$ our dimension formula reproduces a recent result by Argyres et al. Class Field Theory implies a subtlety: certain dimension $k$-tuples $\{Δ_1,\cdots,Δ_k\}$ are consistent only if supplemented by additional selection rules on the electro-magnetic charges, that is, for a SCFT with these Coulomb dimensions not all charges/fluxes consistent with Dirac quantization are permitted. We illustrate the various aspects with several examples and perform a number of explicit checks. We include tables of dimensions for the first few $k$'s.

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