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arXiv 2007.11304math.DG
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变形G_2瞬子/Donaldson-Thomas联系的例子

Examples of deformed G_2-instantons/Donaldson-Thomas connections

Jason D. Lotay, Goncalo Oliveira

摘要:

本文给出了变形G_2-瞬子的第一个非平凡例子,最初称为变形Donaldson-Thomas联络。由此,我们看到变形的G_2-瞬子可以用来区分3-Sasakian 7-流形上的近平行G_2-结构和等距G_2-结构。我们的例子给出了非平凡变形G_2-瞬子的阻塞变形理论和变形G_2-瞬子的模空间具有不同维数分量的情形。最后研究了我们的例子与以变形G_2瞬子为临界点的Chern-Simons型泛函之间的关系。

英文摘要:

In this note, we provide the first non-trivial examples of deformed G_2-instantons, originally called deformed Donaldson-Thomas connections. As a consequence, we see how deformed G_2-instantons can be used to distinguish between nearly parallel G_2-structures and isometric G_2-structures on 3-Sasakian 7-manifolds. Our examples give non-trivial deformed G_2-instantons with obstructed deformation theory and situations where the moduli space of deformed G_2-instantons has components of different dimensions. We finally study the relation between our examples and a Chern-Simons type functional which has deformed G_2-instantons as critical points.

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