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arXiv 0912.2699math.DS
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非一致双曲性、整体控制分裂与保体积超同态的通有性质

Nonuniform Hyperbolicity, Global Dominated Splittings and Generic Properties of Volume-Preserving Diffeomorphisms

Artur Avila, Jairo Bochi

摘要:

研究了紧致流形上的一般保体积同态。我们证明了以下性质一般在$C^1$拓扑中成立:要么在几乎每个点上至少有一个零李雅普诺夫指数,要么只有非零指数的点的集合形成遍历分量。此外,如果这个非一致双曲分支有正测度,那么它在流形上本质上是稠密的(也就是说,它与任何非空开集有正测度交集),并且存在全局支配分裂。对于证明,我们建立了一些新的独立的利益,持有$C^r$ -一般为任何$r \geq 1$,即:遍历分解的连续性,不变集的持久性,和李雅普诺夫指数的$L^1$ -连续性。

英文摘要:

We study generic volume-preserving diffeomorphisms on compact manifolds. We show that the following property holds generically in the $C^1$ topology: Either there is at least one zero Lyapunov exponent at almost every point, or the set of points with only non-zero exponents forms an ergodic component. Moreover, if this nonuniformly hyperbolic component has positive measure then it is essentially dense in the manifold (that is, it has a positive measure intersection with any nonempty open set) and there is a global dominated splitting. For the proof we establish some new properties of independent interest that hold $C^r$-generically for any $r \geq 1$, namely: the continuity of the ergodic decomposition, the persistence of invariant sets, and the $L^1$-continuity of Lyapunov exponents.

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