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arXiv 1306.3938hep-th
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C^2/Z_p上的陪集共形场论与瞬子计数

Coset conformal field theory and instanton counting on C^2/Z_p

M. N. Alfimov, A. A. Belavin, G. M. Tarnopolsky

备注：
23 pages, 1 figure
发表信息：
JHEP 1308, 134 (2013)
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摘要：

利用对称代数$\mathcal{A}(2,p)=\hat{\mathfrak{gl}}(n)_{2}/\hat{\mathfrak{gl}}(n-p)_2$研究了共形场论。为了支持该代数作用于$\mathbb{C}^{2}/\mathbb{Z}_{p}$上瞬子模空间的猜想，我们计算了它的表示的特征，并检验了它们与瞬子模空间不动点的生成函数的一致性.我们证明了代数$\mathcal{A}(2,p)$可以用两种方式实现。第一个实现与$p$ Virasoro和$p$ Heisenberg代数的交叉积：$\mathcal{H}^{p}\times \textrm{Vir}^{p}$有关。第二个实现与$\mathcal{H}^{p}\times \hat{\mathfrak{sl}}(p)_2\times (\hat{\mathfrak{sl}}(2)_p \times \hat{\mathfrak{sl}}(2)_{n-p}/\hat{\mathfrak{sl}}(2)_n)$有关。这两种实现的等价性为$\mathcal{A}(2,p)$的特征提供了非平凡的恒等式。$\mathbb{C}^{2}/\mathbb{Z}_{p}$上瞬子的模空间允许两种不同的紧化。这导致$\mathcal{A}(2,p)$的表示有两种不同的基础。我们用这个事实来解释瞬子纯配分函数的两种形式的存在。

英文摘要：

We study conformal field theory with the symmetry algebra $\mathcal{A}(2,p)=\hat{\mathfrak{gl}}(n)_{2}/\hat{\mathfrak{gl}}(n-p)_2$. In order to support the conjecture that this algebra acts on the moduli space of instantons on $\mathbb{C}^{2}/\mathbb{Z}_{p}$, we calculate the characters of its representations and check their coincidence with the generating functions of the fixed points of the moduli space of instantons. We show that the algebra $\mathcal{A}(2,p)$ can be realized in two ways. The first realization is connected with the cross-product of $p$ Virasoro and $p$ Heisenberg algebras: $\mathcal{H}^{p}\times \textrm{Vir}^{p}$. The second realization is connected with: $\mathcal{H}^{p}\times \hat{\mathfrak{sl}}(p)_2\times (\hat{\mathfrak{sl}}(2)_p \times \hat{\mathfrak{sl}}(2)_{n-p}/\hat{\mathfrak{sl}}(2)_n)$. The equivalence of these two realizations provides the non-trivial identity for the characters of $\mathcal{A}(2,p)$. The moduli space of instantons on $\mathbb{C}^{2}/\mathbb{Z}_{p}$ admits two different compactifications. This leads to two different bases for the representations of $\mathcal{A}(2,p)$. We use this fact to explain the existence of two forms of the instanton pure partition functions.

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