Regensburg 2019 – scientific programme

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SOE: Fachverband Physik sozio-ökonomischer Systeme

SOE 12: Poster

SOE 12.14: Poster

Tuesday, April 2, 2019, 16:00–19:00, Poster A

Noise-induced chimeras in dynamical networks: nonlocally coupled ring versus 2D modular fractal connectivity — •Anna Zakharova, Nikolas Heym, and Eckehard Schöll — Technische Universität Berlin

For a network of coupled neural elements in the excitable regime we show that chimera patterns can be induced by noise. We compare the results for two different network topologies: nonlocal coupling on a ring and 2D modular fractal connectivity, with the latter being relevant for modeling of the brain. In contrast to classical chimeras, occurring in noise-free oscillatory networks, these patterns have features of two phenomena: coherence resonance and chimera states. Therefore, we call them coherence-resonance chimeras [1]. They demonstrate the constructive role of noise and appear for intermediate values of noise intensity. We investigate the impact of time delay on coherence-resonance chimeras and show that time-delayed feedback can be used to control the noise-induced chimera states [2].

[1] N. Semenova, A. Zakharova, V. Anishchenko, E. Schöll, Coherence-resonance chimeras in a network of excitable elements, Phys. Rev. Lett. 117, 014102 (2016)

[2] A. Zakharova, N. Semenova, V. Anishchenko, E. Schöll, Time-delayed feedback control of coherence resonance chimeras, Chaos 27, 114320 (2017)