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arXiv math/9812117math.DGmath.PR
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随机流在黎曼叶理中的应用

An Application of Stochastic Flows to Riemannian Foliations

Alan Mason

摘要:

在紧致流形上适应黎曼叶状的标架丛上构造了一个随机流。证明了所得到的转移半群的生成元A保持基本函数和形式,并且存在一个本质唯一的严格正光滑函数φ满足A^* φ = 0.这个函数被用来扰动度量,和应用的遍历定理表明,存在一个类似的度量的中曲率的基本投影是基本调和。

英文摘要:

A stochastic flow is constructed on a frame bundle adapted to a Riemannian foliation on a compact manifold. The generator A of the resulting transition semigroup is shown to preserve the basic functions and forms, and there is an essentially unique strictly positive smooth function phi satisfying A^* phi = 0. This function is used to perturb the metric, and an application of the ergodic theorem shows that there exists a bundle-like metric for which the basic projection of the mean curvature is basic-harmonic.

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