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arXiv 0810.3781nlin.CD
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一维光滑映射中变李雅普诺夫指数的鲁棒混沌

Robust chaos with variable Lyapunov exponent in smooth one-dimensional maps

Juan M. Aguirregabiria

摘要:

我们提出了几种新的简单的方法来产生光滑的一维地图显示强大的混乱,即,整个参数区间的混沌。与以前的方法不同,这里构造的映射的李雅普诺夫指数随参数变化很大。我们证明了在以前的工作中使用的负Schwarzian导数的条件,这不是一个必要条件的鲁棒混沌。最后,我们证明了在以前的工作中构造的映射总是具有李雅普诺夫指数$\ln 2$,因为它们通过光滑同胚相互共轭并与帐篷映射共轭.在这里提出的方法中,映射具有可变的李雅普诺夫系数,因为它们通过类似于闵可夫斯基问号函数的非光滑同胚共轭。

英文摘要:

We present several new easy ways of generating smooth one-dimensional maps displaying robust chaos, i.e., chaos for whole intervals of the parameter. Unlike what happens with previous methods, the Lyapunov exponent of the maps constructed here varies widely with the parameter. We show that the condition of negative Schwarzian derivative, which was used in previous works, is not a necessary condition for robust chaos. Finally we show that the maps constructed in previous works have always the Lyapunov exponent $\ln 2$ because they are conjugated to each other and to the tent map by means of smooth homeomorphisms. In the methods presented here, the maps have variable Lyapunov coefficients because they are conjugated through non-smooth homeomorphisms similar to Minkowski's question mark function.

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