Loose Legendrian rigidity under contact homeomorphisms

Let MM be a smooth manifold and let ΛSM\Lambda\subseteq S^*M be a proper loose Legendrian embedding. Consider contactomorphisms φnCont0(SM,ξstd)\varphi_n\in\operatorname{Cont}_0(S^*M,\xi_{\mathrm{std}}) such that φnφ\varphi_n\to\varphi_\infty in the C0C^0-topology, where φ\varphi_\infty is a homeomorphism. Assume that φ(Λ)\varphi_\infty(\Lambda) is also smooth.

Loose Legendrian rigidity conjecture. The Legendrian φ(Λ)\varphi_\infty(\Lambda) is still loose.

This would rule out a known non-loose Legendrian in a cosphere bundle arising as the C0C^0-limit of a loose Legendrian. The conjecture is motivated by invariance properties of sheaf categories and Legendrian contact homology; the source indicates that the corresponding higher-dimensional rigidity statement is not known.

Sources & referencesView supporting material

Primary source

Tomohiro Asano, Yuichi Ike, Christopher Kuo and Wenyuan Li, “C^0-rigidity of Legendrians and coisotropics via sheaf quantization”, arXiv:2510.01746 (2025).

Additional references

2 papers in this index state this conjecture (2012–2025). The statement above is taken from the most recent of them; the others are arXiv:1204.3145.

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