Uniform boundedness conjecture for the pathwise critical coupling strength

Let NN be the number of particles, let Θ0\Theta^0 be an initial phase vector, and let Ω=(ν1,,νN)\Omega=(\nu_1,\ldots,\nu_N) be the vector of natural frequencies. Write D(Ω)D(\Omega) for the diameter of the frequencies and κpc(Θ0,Ω,N)\kappa_{pc}(\Theta^0,\Omega,N) for the pathwise critical coupling strength. The conjecture concerns almost every choice of Θ0\Theta^0 and Ω\Omega. Uniform boundedness conjecture. The pathwise critical coupling strength is uniformly bounded over almost every Θ0\Theta^0 in either of the following senses: there is a universal constant C1C\geq 1, independent of NN, Θ0\Theta^0, and Ω\Omega, such that

κpc(Θ0,Ω,N)CD(Ω)\kappa_{pc}(\Theta^0,\Omega,N)\leq C D(\Omega)

for almost every Θ0\Theta^0 and Ω\Omega; and, in the strong version, one may take C=1C=1, so that

κpc(Θ0,Ω,N)D(Ω).\kappa_{pc}(\Theta^0,\Omega,N)\leq D(\Omega).

The weak and strong versions are motivated by numerical simulations, while the pathwise critical coupling strength is otherwise poorly understood. The source gives no resolution of either version.

Sources & referencesView supporting material

Primary source

Seung-Yeal Ha and Sang Woo Ryoo, “Asymptotic phase-locking dynamics and critical coupling strength for the Kuramoto model”, arXiv:2004.05252 (2020).

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