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arXiv 1609.09780math.AGmath-phmath.MP
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P2上框架辛丛和正交丛的模空间及K-理论Nekrasov分拆函数

Moduli spaces of framed symplectic and orthogonal bundles on P2 and the K-theoretic Nekrasov partition functions

Jaeyoo Choy

摘要:

令$K$是紧李群$USp(N/2)$或$SO(N, R)$。令$M^K_n$是$S^4$上的框架K-瞬子的模空间,瞬子数为$n$。Donaldson(1984)赋予了$M^K_n$自然的模式结构。它是$μ^{-1}(0)$的GIT商的一个Zebriki开子集,其中$μ$是一个全纯矩映射,使得$μ^{-1}(0)$由ADHM数据组成。研究了$μ^{-1}(0)$及其GIT商的几何性质,如完全交性、不可约性、约化性和正规性.如果$K=USp(N/2)$,则$μ$是平坦的,并且$μ^{-1}(0)$是任何$n$甚至$N$的不可约正规簇。如果是$K = SO(N, R)$,则证明低$n$和$N$的结果相似。作为应用,可以得到Nekrasov和Shadchin(2004)的K理论Nekrasov配分函数的数学解释。

英文摘要:

Let $K$ be the compact Lie group $USp(N/2)$ or $SO(N, R)$. Let $M^K_n$ be the moduli space of framed K-instantons over $S^4$ with the instanton number $n$. By Donaldson (1984), $M^K_n$ is endowed with a natural scheme structure. It is a Zariski open subset of a GIT quotient of $μ^{-1}(0)$, where $μ$ is a holomorphic moment map such that $μ^{-1}(0)$ consists of the ADHM data. The purpose of the paper is to study the geometric properties of $μ^{-1}(0)$ and its GIT quotient, such as complete intersection, irreducibility, reducedness and normality. If $K=USp(N/2)$ then $μ$ is flat and $μ^{-1}(0)$ is an irreducible normal variety for any $n$ and even $N$. If $K = SO(N, R)$ the similar results are proven for low $n$ and $N$. As an application one can obtain a mathematical interpretation of the K-theoretic Nekrasov partition function of Nekrasov and Shadchin (2004).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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