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arXiv 2005.03680hep-thmath-phmath.AGmath.MPmath.NT
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来自模反常的Vafa-Witten不变量

Vafa-Witten invariants from modular anomaly

Sergei Alexandrov

AI总结:

本文利用模反常的普适公式,提取了Hirzebruch和del Pezzo曲面上U(N) Vafa-Witten理论的全纯生成函数,推导出所有N的瞬子模空间Betti数闭式公式,并揭示了fiber-base对偶及新不变量。

摘要:

最近,人们提出了一种普适公式,用于对具有 $N=2$ 超对称性的各种理论中精细 BPS 指数生成函数进行非全纯模完备。该公式通过较低秩的全纯生成函数来表达这种完备。这里我们证明,对于 Hirzebruch 和 del Pezzo 曲面上的 $U(N)$ Vafa-Witten 理论,该公式可用于提取全纯函数本身,从而提供此类曲面上瞬子模空间的 Betti 数。结果,我们推导出了适用于所有 $N$ 的生成函数及其完备的闭式公式。此外,我们的构造以简单的方式揭示了 fiber-base 对偶的实例,这可用于推导广义 Appell 函数的新的非平凡恒等式。它还暗示了新不变量的存在,但其含义仍然不明。

英文摘要:

Recently, a universal formula for a non-holomorphic modular completion of the generating functions of refined BPS indices in various theories with $N=2$ supersymmetry has been suggested. It expresses the completion through the holomorphic generating functions of lower ranks. Here we show that for $U(N)$ Vafa-Witten theory on Hirzebruch and del Pezzo surfaces this formula can be used to extract the holomorphic functions themselves, thereby providing the Betti numbers of instanton moduli spaces on such surfaces. As a result, we derive a closed formula for the generating functions and their completions for all $N$. Besides, our construction reveals in a simple way instances of fiber-base duality, which can be used to derive new non-trivial identities for generalized Appell functions. It also suggests the existence of new invariants, whose meaning however remains obscure.

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