Kähler package conjecture for corrected perverse cohomology

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Let π:X→Δ\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.

References

Primary source

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

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