Log weak Lefschetz conjecture for log isocrystalline cohomologies

Let YY be a projective SNCL scheme over the log point ss, let EE be a horizontal smooth divisor on YY, and let d=dimYd=\dim Y. Let qq be a nonnegative integer. Write K0=Frac(W)K_0=\operatorname{Frac}(\mathcal W) and, for a W\mathcal W-module MM, write MK0=MWK0M_{K_0}=M\otimes_{\mathcal W}K_0. The closed immersion ι ⁣:EY\iota\colon E\hookrightarrow Y induces

ιcrys ⁣:Hcrysq(Y/W(s))K0Hcrysq(E/W(s))K0.\iota^*_{\rm crys}\colon H^q_{\rm crys}(Y/\mathcal W(s))_{K_0}\longrightarrow H^q_{\rm crys}(E/\mathcal W(s))_{K_0}.

The cohomology groups carry weight filtrations PP.

Log weak Lefschetz conjecture. Assume that OY(E)\mathcal O_Y(E) is ample. Then the morphism above is a filtered isomorphism with respect to PP if qd2q\leq d-2 and strictly injective for q=d1q=d-1.

This is a logarithmic analogue of the weak Lefschetz theorem for log crystalline cohomology. The source introduces it as a conjecture and gives an affirmative result, but the supplied text does not specify whether the full conjecture is resolved.

Sources & referencesView supporting material

Primary source

Yukiyoshi Nakkajima and Fuetaro Yobuko, “Degenerations of log Hodge de Rham spectral sequences, log Kodaira vanishing theorem in characteristic p>0 and log weak Lefschetz conjecture for log crystalline cohomologies”, arXiv:1902.09110 (2022).

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