Finding equilibria of the finite size Kuramoto model amounts to solving a nonlinear system of equations, which is an important yet challenging problem. We translate this into an algebraic geometry problem and use numerical methods to find all of the equilibria for various choices of coupling constants K, natural frequencies, and on different graphs. We note that for even modest sizes (N ∼ 10–20), the number of equilibria is already more than 100 000. We analyze the stability of each computed equilibrium as well as the configuration of angles. Our exploration of the equilibrium landscape leads to unexpected and possibly surprising results including non-monotonicity in the number of equilibria, a predictable pattern in the indices of equilibria, counter-examples to conjectures, multi-stable equilibrium landscapes, scenarios with only unstable equilibria, and multiple distinct extrema in the stable equilibrium distribution as a function of the number of cycles in the graph.
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Research Article|
May 04 2015
Algebraic geometrization of the Kuramoto model: Equilibria and stability analysis
Dhagash Mehta;
Dhagash Mehta
a)
1Department of Applied and Computational Mathematics and Statistics,
University of Notre Dame
, Notre Dame, Indiana 46556, USA
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Noah S. Daleo
;
Noah S. Daleo
b)
2Department of Mathematics,
North Carolina State University
, Raleigh, North Carolina 27695, USA
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Florian Dörfler;
Florian Dörfler
c)
3Automatic Control Laboratory,
Swiss Federal Institute of Technology (ETH) Zürich
, 8092 Zürich, Switzerland
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Jonathan D. Hauenstein
Jonathan D. Hauenstein
d)
1Department of Applied and Computational Mathematics and Statistics,
University of Notre Dame
, Notre Dame, Indiana 46556, USA
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Citation
Dhagash Mehta, Noah S. Daleo, Florian Dörfler, Jonathan D. Hauenstein; Algebraic geometrization of the Kuramoto model: Equilibria and stability analysis. Chaos 1 May 2015; 25 (5): 053103. https://doi.org/10.1063/1.4919696
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