Emergence of solitary and chimera states in adaptive pendulum networks under diverse learning rules

TL;DR

This paper explores how adaptive learning rules like Hebbian and STDP influence collective behaviors in pendulum oscillator networks, revealing spontaneous solitary states and complex patterns without delays or external perturbations.

Contribution

It demonstrates the emergence of solitary and chimera states in delay-free adaptive oscillator networks, a novel finding in the context of biologically inspired adaptation mechanisms.

Findings

Solitary states arise spontaneously without delays or external perturbations.

Different adaptation rules lead to diverse collective dynamical patterns.

The study provides detailed phase diagrams and stability analysis of observed states.

Abstract

We investigate the interplay between phase lag and adaptive learning rules in a network of identical pendulum oscillators, where the coupling strengths evolve dynamically in response to the oscillators' states. Specifically, we examine two biologically inspired adaptation mechanisms, Hebbian and spike-timing-dependent plasticity (STDP), and their influence on the emergence of collective dynamical patterns. Under Hebbian adaptation, the network exhibits a wide range of organized behaviors, including two-cluster, solitary, multi-antipodal, and chimera states. In contrast, STDP coupling induces splay, splay-cluster, and splay-chimera configurations. Importantly, we find that the solitary state arises spontaneously in this adaptive network without requiring delays, nonlocal coupling, or external perturbations; instead, it is induced purely by variations in the phase-lag parameter. To the best of our knowledge, such delay-free and symmetry-preserving emergence of solitary behavior has not been reported previously in adaptive oscillator systems. To systematically characterize the resulting dynamical transitions, we employ two complementary incoherence measures based on the local standard deviation of (i) time-averaged frequencies and (ii) instantaneous phases across spatial bins, enabling the construction of detailed two-parameter phase diagrams. Analytical stability analysis of the two-cluster state shows strong agreement with numerical simulations, revealing regions of pronounced multistability. These findings establish adaptive pendulum networks as a minimal yet powerful framework for studying self-organized synchronization, chimera formation, and multistable transitions driven by diverse adaptation mechanisms.