The real spectral-curve component conjecture

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

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

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

maps Γℓ∗\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.

References

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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