Shelukhin's Hofer-Zehnder conjecture for local Floer homology

Let (M,ω)(M,\omega) be a closed symplectic manifold and let K{\mathbb K} be a ground field. For a possibly degenerate Hamiltonian diffeomorphism ϕ\phi, define

N(ϕ,K)=xFix(ϕ)dimKHFloc(ϕ,x).N(\phi,{\mathbb K})=\sum_{x\in\operatorname{Fix}(\phi)}\dim_{\mathbb K}\operatorname{HF}^{\operatorname{loc}}(\phi,x).

Shelukhin's Hofer-Zehnder conjecture. If

N(ϕ,K)>dimKH(M;K),N(\phi,\mathbb K)>\dim_{\mathbb K}\operatorname{H}_{*}(M;\mathbb K),

then ϕ\phi must have infinitely many periodic points. This is a precise Floer-theoretic interpretation of the Hofer-Zehnder conjecture that includes degenerate Hamiltonian diffeomorphisms. The source discusses the conjecture as part of the ongoing effort to prove the Hofer-Zehnder statement beyond the symplectically aspherical and spherically monotone cases.

Sources & referencesView supporting material

Primary source

Marcelo S. Atallah and Han Lou, “On the Hofer-Zehnder conjecture for semipositive symplectic manifolds”, arXiv:2309.13791 (2026).

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