基于SymTFT的Vafa-Witten配分函数的模性
Modularity of Vafa-Witten Partition Functions from SymTFT
摘要：
在乘积几何$T^2\times S$上紧化的$N$ M5膜的6d（2，0）理论，其中$S$是Kähler 4-流形，可以在两个不同的极限下研究。在一个极限中，将$T^2$的大小取为零，并与拓扑扭曲一起得到$S$上的Vafa-Witten配分函数。另一方面，将$S$的大小取为零导致2d $\mathcal{N}=(0,4)$理论。这就产生了一个2d-4d对应，其中Vafa-Witten配分函数与2d理论的特征一致。在本文中，我们测试这个猜想Hirzebruch和Del Pezzo曲面采用SymTFT的技术，以显示双方的模变换性质匹配。此外，我们还构造了模不变的二维绝对配分函数，并验证了它们在耦合空间自对偶点的离散对称性下是不变的。这为二维SCFT中存在对偶缺陷提供了进一步的线索。
英文摘要：
The 6d (2,0) theory of $N$ M5 branes compactified on the product geometry $T^2\times S$, where $S$ is a Kähler 4-manifold, can be studied in two different limits. In one limit, the size of $T^2$ is taken to zero and together with a topological twist one arrives at the Vafa-Witten partition function on $S$. On the other hand, taking the size of $S$ to zero leads to a 2d $\mathcal{N}=(0,4)$ theory. This gives rise to a 2d-4d correspondence where the Vafa-Witten partition functions are identified with the characters of the 2d theory. In this paper, we test this conjecture for Hirzebruch and Del Pezzo surfaces by employing the technique of SymTFT to show that the modular transformation properties of the two sides match. Moreover, we construct modular invariant 2d absolute partition functions and verify that they are invariant under gauging of a discrete symmetry at the self-dual point in coupling space. This provides further hints for the presence of duality defects in the 2d SCFT.
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