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arXiv 1306.1605math.DS
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复单频上循环

Complex one-frequency cocycles

Artur Avila, Svetlana Jitomirskaya, Christian Sadel

摘要:

证明了在任意维解析单频复值上圈的稠密开集上,Oseledets滤子是支配的或平凡的.其内在机制与连续上循环的Bochi-Viana定理不同,后者将非支配性与李雅普诺夫指数的不连续性联系起来。事实上,在我们的设置的李雅普诺夫指数示出连续依赖于上循环,即使初始的非理性频率是允许变化的。另一方面,这最后一个属性提供了一个很好的控制的周期性近似的上循环,使我们能够表明,统治的特点是,在存在的差距在李雅普诺夫谱,由额外的规律性的依赖总和的李雅普诺夫指数。

英文摘要:

We show that on a dense open set of analytic one-frequency complex valued cocycles in arbitrary dimension Oseledets filtration is either dominated or trivial. The underlying mechanism is different from that of the Bochi-Viana Theorem for continuous cocycles, which links non-domination with discontinuity of the Lyapunov exponent. Indeed, in our setting the Lyapunov exponents are shown to depend continuously on the cocycle, even if the initial irrational frequency is allowed to vary. On the other hand, this last property provides a good control of the periodic approximations of a cocycle, allowing us to show that domination can be characterized, in the presence of a gap in the Lyapunov spectrum, by additional regularity of the dependence of sums of Lyapunov exponents.

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