Wang–Hu–Long's irrationally elliptic Reeb-orbit conjecture

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Let Σ2n−1\Sigma^{2n-1} bound a convex domain in R2n\mathbb{R}^{2n}, with n≥2n\geq 2, and let T(Σ)\mathcal{T}(\Sigma) denote the set of prime closed Reeb orbits on Σ\Sigma. A closed Reeb orbit is irrationally elliptic when its linearized return map decomposes into rotations whose rotation angles are irrational multiples of π\pi. Wang–Hu–Long conjecture. If

#T(Σ)<∞,\#\mathcal{T}(\Sigma)<\infty,

then all the closed Reeb orbits on Σ\Sigma are irrationally elliptic. This is known in dimension four and in several special higher-dimensional settings, but the general convex case remains open.

References

Primary source

Xiaorui Li, Hui Liu and Wei Wang, “Two irrationally elliptic closed orbits of Reeb flows on the boundary of star-shaped domain in R^2n”, arXiv:2510.06597 (2025).

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