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arXiv math/0609841math.SGhep-thmath.AG
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非紧等效子的等变体积与瞬子计数

Equivariant volumes of non-compact quotients and instanton counting

Johan Martens

摘要:

受Nekrasov瞬子计数的启发,本文讨论了利用非交换局部化的Jeffrey-Kirwan留数公式计算辛几何和超Kähler几何中非紧同分子的等变体积的方法.为了克服非紧性,我们使用不同的辛割,以减少问题到一个紧凑的设置,并研究在极限,恢复原来的问题。我们实现了这种方法的ADHM结构的框架杨-米尔斯瞬子的模空间$\R^{4}$和重新推导的公式的等变体积早先获得的Nekrasov-Shadchin,表示这些体积作为一个单一的有理函数的迭代剩余。

英文摘要:

Motivated by Nekrasov's instanton counting, we discuss a method for calculating equivariant volumes of non-compact quotients in symplectic and hyper-Kähler geometry by means of the Jeffrey-Kirwan residue-formula of non-abelian localization. In order to overcome the non-compactness, we use varying symplectic cuts to reduce the problem to a compact setting, and study what happens in the limit that recovers the original problem. We implement this method for the ADHM construction of the moduli spaces of framed Yang-Mills instantons on $\R^{4}$ and rederive the formulas for the equivariant volumes obtained earlier by Nekrasov-Shadchin, expressing these volumes as iterated residues of a single rational function.

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