Kähler package conjecture for corrected perverse cohomology

Let π:XΔ\pi:\mathcal X\to\Delta be a projective conifold degeneration, and let P\mathcal P be the corrected perverse object constructed from nearby and vanishing cycles. A mixed-Hodge-module refinement of P\mathcal P means a refinement compatible with the projective geometry of the degeneration. Kähler package conjecture. If P\mathcal P admits such a refinement, then the hypercohomology groups

Hk(X0,P)\mathbb H^k(X_0,\mathcal P)

should satisfy a Kähler-type package analogous to that of intersection cohomology, including duality, Lefschetz-type isomorphisms, and Hodge–Riemann bilinear relations. This extends the established Hodge-theoretic package for intersection cohomology to the corrected perverse object; the required mixed-Hodge-module realization and the resulting duality, Lefschetz, and Hodge–Riemann statements remain conjectural in this setting.

Sources & referencesView supporting material

Primary source

Abdul Rahman, “Perverse Extensions and Limiting Mixed Hodge Structures for Conifold Degenerations”, arXiv:2604.04355 (2026).

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