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arXiv 2209.03039math.DG
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$G$ -瞬子模空间上指标和方向的局部化

Localization of indices and orientations on $G$-instanton moduli spaces

Jin Miyazawa

摘要:

Joyce,Tanaka和Upmeier给出了闭四维流形上的$G$ -瞬子模空间的定向,它是用$4$ -流形上的$\mathrm{Spin}^c$结构正则定义的.在本说明中,我们在稍微更一般的设置中描述由$\mathrm{Spin}^c$结构的其他选择给出的取向之间的关系。利用Dirac型算子指数的Witten局部化,给出了瞬子模空间可定向性的另一种证明和Joyce,Tanaka和Upmeier关于定向性的另一种构造.

英文摘要:

Joyce, Tanaka, and Upmeier give an orientation of the $G$-instanton moduli spaces on a closed four manifolds which is canonically defined using the the $\mathrm{Spin}^c$ structure on the $4$-manifold. In this note, we describe the relation between the orientations given by other choices of the $\mathrm{Spin}^c$ structures, in a slightly more general setting. Furthermore, we give an alternative proof of the orientability of the instanton moduli spaces and an alternative construction of the orientation by Joyce, Tanaka and Upmeier, by using Witten localization of the index of a Dirac type operator.

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