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arXiv 1802.04777nlin.CD
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通向多重混沌的连续路径

The continuous route to multi-chaos

Yoshitaka Saiki, Miguel A. F. Sanjuan, James A. Yorke

摘要:

对于低维混沌吸引子,其所有周期轨道的不稳定维数通常只有一个,可以说这种吸引子表现出“单混沌”。在高维混沌吸引子中,轨道倾向于穿过相空间的不同区域,有些区域比其他区域更不稳定。这种异质性使得可预测性甚至比低维同质混沌吸引子更困难。一个混沌吸引子是“多混沌”的,如果吸引子的每一个点都任意接近于具有不同数目的不稳定维数的周期点。我们相信大多数具有高维吸引子的物理系统都是这种类型。我们对多重混沌做了三个解释,我们用三个二维多重混沌吸引子的范例进行了探索。它们可以被认为是小规模的例子,可以让我们深入了解真正的高维现象。当参数变化时,当吸引子连续变化时,我们发现了从单混沌到多混沌的唯一路径。这种多混沌分岔(MCB)是一种周期轨道分岔,周期轨道的一个分支产生了许多不同于单混沌的不稳定维数。

英文摘要:

For low-dimensional chaotic attractors there is usually a single number of unstable dimensions for all of its periodic orbits and we can say such attractors exhibit "mono-chaos". In high-dimensional chaotic attractors, trajectories are prone to travel through quite different regions of phase space, some far more unstable than others. This heterogeneity makes predictability even more difficult than in low-dimensional homogeneous chaotic attractors. A chaotic attractor is "multi-chaotic" if every point of the attractor is arbitrarily close to periodic points with different numbers of unstable dimensions. We believe that most physical systems possessing a high-dimensional attractor are of this type. We make three conjectures about multi-chaos which we explore using three two-dimensional paradigmatic examples of multi-chaotic attractors. They can be thought of as small-scale examples that give insight for real high-dimensional phenomena. We find a single route from mono-chaos to multi-chaos if an attractor changes continuously as a parameter is varied. This multi-chaos bifurcation (MCB) is a periodic orbit bifurcation; one branch of periodic orbits is created with a number of unstable dimensions that is different from the mono-chaos.

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