Palis-type conjecture for convex hypersurfaces and robust heterodimensional cycles

Let (Y,ξ)(Y,\xi) be a contact manifold, and consider the space of its closed oriented hypersurfaces with the C2C^2 topology. A hypersurface is positive-negative when its characteristic foliation contains a heterodimensional cycle CC whose indices satisfy

ind(C+)n1andind(C)n.\operatorname{ind}(C_+)\leq n-1\qquad\text{and}\qquad \operatorname{ind}(C_-)\geq n.

Palis-type conjecture. The space of closed oriented hypersurfaces in a contact manifold (Y,ξ)(Y,\xi) decomposes into two open and C2C^2-dense sets: the set of convex hypersurfaces and the set of hypersurfaces containing a robust positive-negative heterodimensional cycle CC. The two sets are disjoint in the results described by the source, and each is stated there to be nonempty and C0C^0-dense in the relevant higher-dimensional setting; the proposed C2C^2-dense decomposition remains open.

Sources & referencesView supporting material

Primary source

Julian Chaidez and Michael Huang, “Convex hypersurfaces and robust heterodimensional dynamics”, arXiv:2607.03649 (2026).

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