Ergodicity conjecture for anti-symmetric skew products over locally Hamiltonian flows

From papers

Let ψR\psi_\mathbb{R} be a locally Hamiltonian flow on a compact surface MM for which Theorem~ holds. Let MM' be one of its minimal components of genus g1g\geq 1, and set

m:=max{mσ:σFix(ψR)M}.m:=\max\{m_\sigma:\sigma\in\operatorname{Fix}(\psi_\mathbb{R})\cap M'\}.

For fCm(M)f\in C^m(M), suppose that Di(f)=0D_i(f)=0 for all 1ig1\leq i\leq g, that Cσ,k(f)=0\mathfrak{C}^k_{\sigma,\ell}(f)=0 for every σFix(ψR)M\sigma\in\operatorname{Fix}(\psi_\mathbb{R})\cap M', 0k<mσ20\leq k<m_\sigma-2, and Lσ\ell\in\mathcal{L}^\sigma_\sim, and that

Cσ,mσ2(f)0\mathfrak{C}^{m_\sigma-2}_{\sigma,\ell}(f)\neq 0

for some σFix(ψR)M\sigma\in\operatorname{Fix}(\psi_\mathbb{R})\cap M' and Lσ\ell\in\mathcal{L}^\sigma_\sim. Working conjecture. Under these conditions, the skew product flow ψRf\psi^f_\mathbb{R} is ergodic.

The conjecture proposes that the symmetry condition on logarithmic singularities is unnecessary for ergodicity when the relevant lower-order obstructions vanish and the first nonvanishing singularity coefficient occurs at order mσ2m_\sigma-2. It would extend known ergodicity results for symmetric logarithmic singularities to minimal components with saddle loops, where symmetry is naturally broken. The source does not state a resolution, so the conjecture is treated as open.

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Sources & referencesView supporting material

Primary source

Przemysław Berk, Krzysztof Frączek and Frank Trujillo, “On the ergodicity of anti-symmetric skew products with singularities and its applications”, arXiv:2412.21067 (2026).

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