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arXiv 1012.0291math.DG
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Ricci映射流与调和映射流耦合的结果

Results on coupled Ricci and harmonic map flows

Michael Bradford Williams

摘要:

我们探讨调和Ricci流-也就是Ricci流与调和映射流耦合-既因为它在与里奇流相关的某些主丛构造中自然出现,也因为它本身是一种几何流。我们证明了一个自然的几何背景下的流动是一个特殊的情况下,局部$\mathbb{R}^N$不变的里奇流的洛特,并提供梯度孤子的流动的例子。我们证明了一个版本的汉密尔顿的紧性定理的流量,然后推广到范畴的étale黎曼群胚。最后,我们提供了一个详细的例子,解决方案的流动李群$\Nil^3$。

英文摘要:

We explore the harmonic-Ricci flow---that is, Ricci flow coupled with harmonic map flow---both as it arises naturally in certain principal bundle constructions related to Ricci flow and as a geometric flow in its own right. We demonstrate that one natural geometric context for the flow is a special case of the locally $\mathbb{R}^N$-invariant Ricci flow of Lott, and provide examples of gradient solitons for the flow. We prove a version of Hamilton's compactness theorem for the flow, and then generalize it to the category of étale Riemannian groupoids. Finally, we provide a detailed example of solutions to the flow on the Lie group $\Nil^3$.

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