The degenerate Arnol'd conjecture for Hamiltonian-isotopic Lagrangians

Let (M,ω)(M,\omega) be a closed symplectic manifold, and let L0,L1a0ML_0,L_1 a0M be a Hamiltonian-isotopic pair of Lagrangians. Suppose each LiL_i is connected and closed, and satisfies

ωπ2(M,Li)=0.\omega\vert_{\pi_2(M,L_i)}=0.

Here C(Li)C^\infty(L_i) denotes the smooth real-valued functions on LiL_i, and Crit(f)\operatorname{Crit}(f) is the set of critical points of ff.

Degenerate Arnol'd conjecture. The intersection satisfies

L0L1min{Crit(f):fC(Li)}.\lvert L_0\cap L_1\rvert\geq\min\big\{\lvert\operatorname{Crit}(f)\rvert:f\in C^\infty(L_i)\big\}.

This is a lower bound for possibly degenerate Lagrangian intersections, motivated by Floer homotopy theory and intended to strengthen intersection bounds in settings such as plumbings of cotangent bundles. The supplied text gives no evidence that this conjecture has been resolved.

Sources & referencesView supporting material

Primary source

Kenneth Blakey and Ciprian Mircea Bonciocat, “Parameterized Lagrangian Floer homotopy”, arXiv:2506.20122 (2025).

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