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arXiv 1306.5931math.DGmath.SG
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准埃尔米特李群的曲率流

Curvature flows for almost-hermitian Lie groups

Jorge Lauret

摘要:

我们研究曲率流在局部齐次的情况下(例如,紧的李群,solvmanifold,nilmanifold)在一个统一的方式,通过考虑一个通用的流在几个自然条件下的广泛类的几乎厄米特结构。作为一个主要工具,我们使用的ODE系统定义的各种2n维李代数,称为括号流,其解决方案不同于那些原来的曲率流,只有拉回的时间依赖的同态。该方法已被用于研究齐次流形上的里奇流,是有用的,以更好地可视化可能的点的限制的解决方案,根据不同的重新标度,以及解决的正则性问题。不朽的,古老的和自相似的解决方案自然产生的括号流的定性分析。对Chern-里奇流和辛曲率流作了更详细的讨论。

英文摘要:

We study curvature flows in the locally homogeneous case (e.g. compact quotients of Lie groups, solvmanifolds, nilmanifolds) in a unified way, by considering a generic flow under just a few natural conditions on the broad class of almost-hermitian structures. As a main tool, we use an ODE system defined on the variety of 2n-dimensional Lie algebras, called the bracket flow, whose solutions differ from those to the original curvature flow by only pull-back by time-dependent diffeomorphisms. The approach, which has already been used to study the Ricci flow on homogeneous manifolds, is useful to better visualize the possible pointed limits of solutions, under diverse rescalings, as well as to address regularity issues. Immortal, ancient and self-similar solutions arise naturally from the qualitative analysis of the bracket flow. The Chern-Ricci flow and the symplectic curvature flow are considered in more detail.

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