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arXiv math/9905205math.DS
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双曲测度的维数与乘积结构

Dimension and product structure of hyperbolic measures

Luis Barreira, Yakov Pesin, Jörg Schmeling

摘要:

证明了光滑黎曼流形的C^{1+α}双曲型同态下的双曲型测度不变量具有渐近的“几乎”局部积结构,即,它的密度可以近似为稳定流形和非稳定流形上的密度的乘积,直到小的指数。这还不知道,甚至措施支持本地最大的双曲集。利用双曲测度的这一性质,我们证明了光滑动力系统维数论中长期存在的Eckmann-Ruelle猜想:每个双曲测度在C^{1+α}双同态下不变量的点态维数几乎处处存在.这意味着一个关键的事实,即几乎所有的维数型的测量(包括豪斯多夫维数,盒维数和信息维)的特征一致。这为双曲测度的分维概念提供了严格的数学证明。

英文摘要:

We prove that every hyperbolic measure invariant under a C^{1+α} diffeomorphism of a smooth Riemannian manifold possesses asymptotically ``almost'' local product structure, i.e., its density can be approximated by the product of the densities on stable and unstable manifolds up to small exponentials. This has not been known even for measures supported on locally maximal hyperbolic sets. Using this property of hyperbolic measures we prove the long-standing Eckmann-Ruelle conjecture in dimension theory of smooth dynamical systems: the pointwise dimension of every hyperbolic measure invariant under a C^{1+α} diffeomorphism exists almost everywhere. This implies the crucial fact that virtually all the characteristics of dimension type of the measure (including the Hausdorff dimension, box dimension, and information dimension) coincide. This provides the rigorous mathematical justification of the concept of fractal dimension for hyperbolic measures.

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