The Arc-Floer conjecture for isolated hypersurface singularities

Let fC{z0,,zn}f \in \mathbb{C}\{z_0,\dots,z_n\} be a convergent power series such that f(0)=0f(\mathbf{0})=0 that defines an isolated hypersurface singularity at the origin. For every integer m1m\geq 1, let Xm\mathcal{X}_m be the mm-th restricted contact locus of ff, let F\mathbb{F} be the Milnor fiber, and let φ:FF\varphi:\mathbb{F}\to\mathbb{F} be its compactly supported exact monodromy. Arc-Floer conjecture. There is an isomorphism

Hc+n(2m+1)(Xm,Z/2Z)HF(φm,+).H_c^{\bullet+n(2m+1)}(\mathcal{X}_m,\mathbb{Z}/2\mathbb{Z})\cong \mathrm{HF}_\bullet(\varphi^m,+).

This conjecture proposes a direct correspondence between the algebraic geometry of restricted contact loci and the symplectic topology of Milnor fibers. It was previously known in particular when mm equals the multiplicity of ff, and the paper proves it for plane curves; the general isolated-hypersurface case remains open.

Sources & referencesView supporting material

Primary source

Javier de la Bodega and Eduardo de Lorenzo Poza, “The Arc-Floer conjecture for plane curves”, arXiv:2308.00051 (2025).

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