The real spectral-curve component conjecture

For each N\ell\in\mathbb N, let Γ\Gamma_\ell be the real spectral curve defined by the polynomial Q(λ,μ2)Q_\ell(\lambda,\mu^2), and consider its intersection with the domain {λ+μ2>0}\{\lambda+\mu^2>0\}. Let Γ\Gamma_\ell^* denote the connected component whose points correspond to the differential equations in question on T2\mathbb T^2 with rotation number \ell.

Real spectral-curve component conjecture. The following assertions hold:

  1. The intersection contains a unique such connected component Γ\Gamma_\ell^*. Every other component corresponds to a positive rotation number less than \ell.
  2. The projection
(λ,μ)λ+μ2(\lambda,\mu)\longmapsto\lambda+\mu^2

maps Γ\Gamma_\ell^* diffeomorphically onto R+\mathbb R_+.

This is presented as a slightly stronger reformulation of a pure real-algebro-geometric conjecture and as a reduction of the connectivity conjecture. The supplied text does not state that it has been resolved.

Sources & referencesView supporting material

Primary source

Alexey Glutsyuk, “On extended model of Josephson junction, linear systems with polynomial solutions, determinantal surfaces and Painlevé III equations”, arXiv:2402.11236 (2024).

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