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

Let Σ2n1\Sigma^{2n-1} bound a convex domain in R2n\mathbb{R}^{2n}, with n2n\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.

Sources & referencesView supporting material

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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