Trajectory-space invariance conjecture for basic de Rham cohomology

Let XX be a compact connected smooth manifold and let vv be a non-vanishing vector field on XX. Assume that vv admits a Lyapunov function and is transversally generic. Let T(v)\mathcal T(v) denote the trajectory space of the vv-flow, equipped with its stratified topological type.

Trajectory-space invariance conjecture. The vv-basic de Rham cohomology

HbasicdR(X,v)H^\ast_{\mathsf{basic}\,d\mathcal{R}}(X,v)

depends only on the stratified topological type of T(v)\mathcal T(v).

The conjecture is motivated by invariance results for basic de Rham cohomology under homeomorphisms in the presence of the Basic Hard Lefschetz property. Whether the stated invariance holds under the given Lyapunov and transversal-genericity assumptions is left open in the supplied text.

Sources & referencesView supporting material

Primary source

Gabriel Katz, “Contact de Rham cohomology and Hodge structures transversal to the Reeb foliations”, arXiv:2502.09773 (2026).

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