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Dynamics of delayed-coupled chaotic logistic maps: influence of network topology, connectivity and delay times

机译:延迟耦合混沌Logistic映射的动力学:网络的影响   拓扑,连接和延迟时间

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摘要

We review our recent work on the synchronization of a network ofdelay-coupled maps, focusing on the interplay of the network topology and thedelay times that take into account the finite velocity of propagation ofinteractions. We assume that the elements of the network are identical ($N$logistic maps in the regime where the individual maps, without coupling, evolvein a chaotic orbit) and that the coupling strengths are uniform throughout thenetwork. We show that if the delay times are sufficiently heterogeneous, foradequate coupling strength the network synchronizes in a spatially homogeneoussteady-state, which is unstable for the individual maps without coupling. Thissynchronization behavior is referred to as ``suppression of chaos by randomdelays'' and is in contrast with the synchronization when all the interactiondelay times are homogeneous, because with homogeneous delays the networksynchronizes in a state where the elements display in-phase time-periodic orchaotic oscillations. We analyze the influence of the network topologyconsidering four different types of networks: two regular (a ring-type and aring-type with a central node) and two random (free-scale Barabasi-Albert andsmall-world Newman-Watts). We find that when the delay times are sufficientlyheterogeneous the synchronization behavior is largely independent of thenetwork topology but depends on the networks connectivity, i.e., on the averagenumber of neighbors per node.
机译:我们回顾了有关延迟耦合映射网络同步的最新工作,重点是网络拓扑的相互作用和考虑了有限传播速度的延迟时间。我们假设网络的元素是相同的(在这种情况下,单个地图没有耦合,而是在混沌轨道上演化的状态下的逻辑地图),并且整个网络的耦合强度是一致的。我们表明,如果延迟时间足够不同,则耦合强度不足,网络将在空间均匀的稳态下进行同步,这对于没有耦合的单个地图来说是不稳定的。这种同步行为被称为``通过随机延迟抑制混沌'',并且与所有交互延迟时间均质时的同步形成对比,因为具有均质延迟,网络在元素显示同相时间周期混沌的状态下进行同步振荡。我们分析了考虑四种不同类型网络的网络拓扑的影响:两种常规网络(具有中央节点的环形和环形)和两种随机网络(自由尺度的Barabasi-Albert和小世界Newman-Watts)。我们发现,当延迟时间足够不均匀时,同步行为在很大程度上与网络拓扑无关,但取决于网络的连通性,即每个节点的平均邻居数。

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