arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2101.07089math.DS
收藏

Anosov同态的李雅普诺夫指数的扩张柔性

Extended flexibility of Lyapunov exponents for Anosov diffeomorphisms

Pablo Carrasco, Radu Saghin

摘要:

Bochi-Katok-Rodriguez Hertz在[BKH 21]中提出了一个关于保守Anosov同态的李雅普诺夫指数柔性的程序,并得到了这方面的部分结果.对于具有强双曲性质的保守Anosov同态,我们建立了它们的李雅普诺夫指数的柔性结果.我们给出了Anosov同态的例子,其强不稳定指数大于线性部分的强不稳定指数。给出了由Anosov同构导出的度量熵大于线性部分熵的例子。这些结果依赖于一种新的类型的变形,超越了以前的Shub-Wilkinson和Baraviera-Bonatti技术的保守系统有一些不变的方向。为了估计李雅普诺夫指数,即使在打破不变丛,我们得到一个抽象的结果(定理3.1),它给出了一些特定的上循环的指数的界限,并可以应用于各种其他设置。我们还包括各种有趣的评论在附录中:我们的例子是$\mathcal{C}^2$鲁棒的,李雅普诺夫指数是连续的(相对于地图),即使在打破不变束,一个类似的结构可以得到的情况下,多个特征值。

英文摘要:

Bochi-Katok-Rodriguez Hertz proposed in [BKH21] a program on the flexibility of Lyapunov exponents for conservative Anosov diffeomorphisms, and obtained partial results in this direction. For conservative Anosov diffeomorphisms with strong hyperbolic properties we establish extended flexibility results for their Lyapunov exponents. We give examples of Anosov diffeomorphisms with the strong unstable exponent larger than the strong unstable exponent of the linear part. We also give examples of derived from Anosov diffeomorphisms with the metric entropy entropy larger than the entropy of the linear part. These results rely on a new type of deformation which goes beyond the previous Shub-Wilkinson and Baraviera-Bonatti techniques for conservative systems having some invariant directions. In order to estimate the Lyapunov exponents even after breaking the invariant bundles, we obtain an abstract result (Theorem 3.1) which gives bounds on exponents of some specific cocycles and which can be applied in various other settings. We also include various interesting comments in the appendices: our examples are $\mathcal{C}^2$ robust, the Lyapunov exponents are continuous (with respect to the map) even after breaking the invariant bundles, a similar construction can be obtained for the case of multiple eigenvalues.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑