Quantifying coherence of chimera states in coupled chaotic systems

Chimera states in coupled oscillator systems present both spatially coherent and incoherent domains. The number and size of these domains depend on many factors like the system parameters and initial conditions. Systematic investigations of these dependences require a quantification of the degree of coherence present in a given snapshot spatial pattern. We propose the use of a local order parameter magnitude combined with the counting of the corresponding plateaus so as to provide such quantification. We use this technique in non-locally coupled lattices of chaotic logistic maps and chaotic Rossler systems to investigate the dependence of the degree of coherence on the coupling strength. (C) 2019 Elsevier B.V. All rights reserved.