Symplectomorphisms with positive metric entropy
Symplectomorphisms with positive metric entropy
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DOI:
10.1112/plms.12437
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发表时间:
2019-04
影响因子:
1.8
通讯作者:
A. Avila;S. Crovisier;A. Wilkinson
中科院分区:
文献类型:
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作者:
A. Avila;S. Crovisier;A. Wilkinson
We obtain a dichotomy for C1$C^1$ ‐generic symplectomorphisms: either all the Lyapunov exponents of almost every point vanish, or the map is partially hyperbolic and ergodic with respect to volume. This completes a program first put forth by Ricardo Mañé. A key ingredient is an analysis of partially hyperbolic sets of positive volume. We generalize to partially hyperbolic invariant sets the main result in Dolgopyat and Wilkinson (Astérisque 287 (2003), 33–60) that stable accessibility is C1$C^1$ ‐dense among partially hyperbolic diffeomorphisms.