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arXiv 1907.09025math.DG
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半共形平坦流形的一个间隙定理

A Gap Theorem for Half-Conformally Flat Manifolds

Brian Weber, Martin Citoler-Saumell

摘要:

我们证明了任何紧致的负型半共形平坦流形,具有有界的$L^2$能量,足够小的数量曲率,和一个非崩溃的假设,有所有的贝蒂数有界。我们表明,这一结果是最佳的从分析的角度来看,通过演示奇异模型,是2端的,并渐近凯勒两端。我们发现,有界的自对偶解的$dω=0$ ALE流形的结束是渐近Kähler,或者他们有一个衰减率为$O(r^{-4})$或更好。

英文摘要:

We show that any compact half-conformally flat manifold of negative type, with bounded $L^2$ energy, sufficiently small scalar curvature, and a non-collapsing assumption, has all betti numbers bounded. We show that this result is optimal from an analytic perspective by demonstrating singularity models that are 2-ended, and are asymptotically Kähler on both ends. We show that bounded self-dual solutions of $dω=0$ on ALE manifold ends are either asymptotically Kähler, or they have a decay rate of $O(r^{-4})$ or better.

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