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arXiv · 2504.06248

Kuramoto meets Koopman: Constants of motion, symmetries, and network motifs

Vincent Thibeault·Benjamin Claveau·Antoine Allard·Patrick Desrosiers
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Abstract

Conserved quantities in phase-oscillator dynamics are well established for identically coupled oscillators, or groups thereof, but the explicit connectivity conditions under which more complex networks admit constants of motion remain difficult to identify. Using Koopman theory, we derive general conditions for the existence of distinct conserved quantities in the Kuramoto model with heterogeneous phase lags on any weighted, directed, and signed graph. To this end, we find Koopman eigenfunctions and continuous Lie symmetries that generate different families of constants of motion. The derived conditions reveal a broad class of network motifs that support conserved quantities and we detect these motifs in hundreds of complex empirical networks. The results thus point to connectivity patterns that can preserve phase relationships over time and motivate further investigations of Koopman spectral properties for dynamics on complex networks.

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Vincent Thibeault, Benjamin Claveau, Antoine Allard, Patrick Desrosiers. 2025-04-08. Kuramoto meets Koopman: Constants of motion, symmetries, and network motifs. https://arxiv.org/abs/2504.06248

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