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arXiv 2009.03500math.DGmath-phmath.MP
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以$S^{4m+3}$为主轨的上齐性1的Einstein度量

Einstein metrics of cohomogeneity one with $S^{4m+3}$ as principal orbit

Hanci Chi

摘要:

本文在两个流形的无穷级数上构造了非紧完备Einstein度量。第一类流形是以$\mathbb{S}^{4m+3}$为主轨、以$\mathbb{HP}^{m}$为奇异轨的向量丛。第二系列的流形是具有相同主轨道的$\mathbb{R}^{4m+4}$。对于每种情况,构造了一个连续的单参数完全Ricci平坦度量族和一个连续的双参数完全负Einstein度量族。特别地,在Ricci平坦族中恢复了Cvetiffel等人在2004年发现的$\mathrm{Spin}(7)$度量$\mathbb{A}_8$和$\mathbb{B}_8$。在$\mathbb{R}^{4m+4}$上构造了一个具有锥奇异性的Ricci平坦度量.研究了所构造的所有爱因斯坦度量的渐近极限。大部分的Ricci平坦度量是渐近局部锥的。渐近锥(AC)度量的边界上的Ricci平坦的家庭。所构造的所有负Einstein度量都是渐近双曲的。

英文摘要:

In this article, we construct non-compact complete Einstein metrics on two infinite series of manifolds. The first series of manifolds are vector bundles with $\mathbb{S}^{4m+3}$ as principal orbit and $\mathbb{HP}^{m}$ as singular orbit. The second series of manifolds are $\mathbb{R}^{4m+4}$ with the same principal orbit. For each case, a continuous 1-parameter family of complete Ricci-flat metrics and a continuous 2-parameter family of complete negative Einstein metrics are constructed. In particular, $\mathrm{Spin}(7)$ metrics $\mathbb{A}_8$ and $\mathbb{B}_8$ discovered by Cvetič et al. in 2004 are recovered in the Ricci-flat family. A Ricci flat metric with conical singularity is also constructed on $\mathbb{R}^{4m+4}$. Asymptotic limits of all Einstein metrics constructed are studied. Most of the Ricci-flat metrics are asymptotically locally conical (ALC). Asymptotically conical (AC) metrics are found on the boundary of the Ricci-flat family. All the negative Einstein metrics constructed are asymptotically hyperbolic (AH).

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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