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arXiv 1609.02730nlin.CD
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具有O(2)对称性的Takens-Bogdanov分岔中的混沌

Chaos in the Takens-Bogdanov bifurcation with O(2) symmetry

A. M. Rucklidge, E. Knobloch

摘要:

Takens-Bogdanov分岔是一个余维2分岔,它为许多物理系统中复杂动力学的存在提供了一个关键。当系统在一维空间中是不变性的且没有左右偏好时,周期边界条件的施加导致了具有O(2)对称性的Takens-Bogdanov分支。G. Dangelmayr和E.诺布洛克,菲尔。横河Soc. London A 322,243(1987)描述了在非线性区域中稳态与行波和驻波之间的相互作用,并且还预测了调制的行波的存在。分析表明,存在几个全球性的分叉附近的平均方法(在原来的分析中使用)失败。在这里,我们表明,使用数值延拓和适当的返回映射的建设相结合,在全球分支,终止分支调制行波,规范形式的Takens-Bogdanov分叉承认级联倍周期分叉以及Shil'nikov型的混沌动力学。因此,混沌是目前任意接近余维两点。

英文摘要:

The Takens-Bogdanov bifurcation is a codimension two bifurcation that provides a key to the presence of complex dynamics in many systems of physical interest. When the system is translation-invariant in one spatial dimension with no left-right preference the imposition of periodic boundary conditions leads to the Takens-Bogdanov bifurcation with O(2) symmetry. This bifurcation, analyzed by G. Dangelmayr and E. Knobloch, Phil. Trans. R. Soc. London A 322, 243 (1987), describes the interaction between steady states and traveling and standing waves in the nonlinear regime and predicts the presence of modulated traveling waves as well. The analysis reveals the presence of several global bifurcations near which the averaging method (used in the original analysis) fails. We show here, using a combination of numerical continuation and the construction of appropriate return maps, that near the global bifurcation that terminates the branch of modulated traveling waves, the normal form for the Takens-Bogdanov bifurcation admits cascades of period-doubling bifurcations as well as chaotic dynamics of Shil'nikov type. Thus chaos is present arbitrarily close to the codimension two point.

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