Quantifying the transition from spiral waves to spiral wave chimeras in a lattice of self-sustained oscillators

Abstract

The present work is devoted to the detailed quantification of the transition from spiral waves to spiral wave chimeras in a network of self-sustained oscillators with two-dimensional geometry. The basic elements of the networks are the van der Pol oscillator and the FitzHugh-Nagumo neuron. Both models are in the regime of relaxation oscillations. We analyze the regime by using the indices of local sensitivity which enables us to evaluate the sensitivity of each individual oscillator at finite time. Spi-ral waves are observed in both lattices when the interaction between elements have the local character. The dynamics of all the elements is regular. There are no high-sensitive regions. We have discovered that when the coupling becomes nonlocal, the features of the systems significantly changes. The oscillation regime of the spiral wave center element switches to chaotic one. Besides this, a region with high sensitivity occurs around this oscillator. Moreover, we show that the latter expands in space with elongation of the coupling range. As a result, an incoherence cluster of the spiral wave chimera is formed exactly within this high-sensitive area. Formation of this cluster is accompanied by the sharp increase in values of the maximal Lyapunov exponent to the positive region. Furthermore, we explore that the system can even switch to hyperchaotic regime, when several Lyapunov exponents becomes positive.

arXiv comment25 pages, 11 figures

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Cited by in corpus (5)

• Complex dynamics of a heterogeneous network of Hindmarsh-Rose neurons
• Route to chaos and chimera states in a network of memristive Hindmarsh-Rose neuron model with external excitation
• Transition from chimera/solitary states to traveling waves
• Identification of single- and double-well coherence-incoherence patterns by the binary distance matrix
• Stability of twisted states on lattices of Kuramoto oscillators