The local Hamiltonian nondisplacement conjecture

Let LL be a displaceable Lagrangian in a symplectic manifold MM, and let dC0d_{C^0} be the C0C^0 distance on Hamiltonian diffeomorphisms. Local Hamiltonian nondisplacement conjecture. There exists δ>0\delta>0 such that, whenever ϕ\phi is a Hamiltonian diffeomorphism of MM satisfying

dC0(\mathds1,ϕ)<δ,d_{C^0}(\mathds{1},\phi)<\delta,

then

Lϕ(L).L\cap\phi(L)\neq\emptyset.

This is a local C0C^0 rigidity statement for Hamiltonian images of a displaceable Lagrangian. The paper presents it as a conjectural variant of local nondisplacement; its general validity is not established in the supplied text.

Sources & referencesView supporting material

Primary source

Marcelo S. Atallah, Jean-Philippe Chassé, Rémi Leclercq and Egor Shelukhin, “Weinstein exactness of nearby Lagrangians and related questions”, arXiv:2410.04158 (2025).

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