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Control of amplitude chimeras by time delay in oscillator networks

Aleksandar Gjurchinovski1,*, Eckehard Schöll2,†, and Anna Zakharova2,‡

  • 1Institute of Physics, Faculty of Natural Sciences and Mathematics, Sts. Cyril and Methodius University, P.O. Box 162, 1000 Skopje, Macedonia
  • 2Institut für Theoretische Physik, Technische Universität Berlin, 10623 Berlin, Germany

  • *aleksandar.gjurchinovski@gmail.com
  • †schoell@physik.tu-berlin.de
  • ‡anna.zakharova@tu-berlin.de
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Phys. Rev. E 95, 042218 – Published 26 April, 2017

DOI: https://doi.org/10.1103/PhysRevE.95.042218

Abstract

We investigate the influence of time-delayed coupling in a ring network of nonlocally coupled Stuart-Landau oscillators upon chimera states, i.e., space-time patterns with coexisting partially coherent and partially incoherent domains. We focus on amplitude chimeras, which exhibit incoherent behavior with respect to the amplitude rather than the phase and are transient patterns, and we show that their lifetime can be significantly enhanced by coupling delay. To characterize their transition to phase-lag synchronization (coherent traveling waves) and other coherent structures, we generalize the Kuramoto order parameter. Contrasting the results for instantaneous coupling with those for constant coupling delay, for time-varying delay, and for distributed-delay coupling, we demonstrate that the lifetime of amplitude chimera states and related partially incoherent states can be controlled, i.e., deliberately reduced or increased, depending upon the type of coupling delay.

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Phys. Rev. E 95, 042218– Published 26 April, 2017
  • Received 17 February 2017

©2017 American Physical Society

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