Variational filtered log p-adic hard Lefschetz conjecture

Let X/S0X/S_0 be a proper SNCL scheme with structural morphism f ⁣:XS0Sf\colon X\longrightarrow S_0\overset{\subset}{\longrightarrow} S, and suppose that the relative dimension of XS0\overset{\circ}{X}\longrightarrow\overset{\circ}{S}_0 is pure of dimension dd. Let LL be a relatively ample line bundle on X/S0\overset{\circ}{X}/\overset{\circ}{S}_0, and let η=c1,crys(L)\eta=c_{1,\operatorname{crys}}(L) be its Chern class in R2fX/S(OX/S)R^2f_{X/S*}({\cal O}_{X/S}). Write PP for the weight filtration. Variational filtered log pp-adic hard Lefschetz conjecture. For every ii, the cup product

ηi ⁣:RdifX/S(OX/S)ZQRd+ifX/S(OX/S)ZQ\eta^i\colon R^{d-i}f_{X/S*}({\cal O}_{X/S})\otimes_{\mathbb Z}{\mathbb Q}\longrightarrow R^{d+i}f_{X/S*}({\cal O}_{X/S})\otimes_{\mathbb Z}{\mathbb Q}

is an isomorphism. In fact, it should be an isomorphism of filtered sheaves

ηi ⁣:(RdifX/S(OX/S)ZQ,P)((Rd+ifX/S(OX/S)ZQ)(i),P),\eta^i\colon (R^{d-i}f_{X/S*}({\cal O}_{X/S})\otimes_{\mathbb Z}{\mathbb Q},P)\overset{\sim}{\longrightarrow}((R^{d+i}f_{X/S*}({\cal O}_{X/S})\otimes_{\mathbb Z}{\mathbb Q})(i),P),

where

Pk(Rd+ifX/S(OX/S)ZQ)(i))=Pk+2iRd+ifX/S(OX/S)ZQ.P_k(R^{d+i}f_{X/S*}({\cal O}_{X/S})\otimes_{\mathbb Z}{\mathbb Q})(i))=P_{k+2i}R^{d+i}f_{X/S*}({\cal O}_{X/S})\otimes_{\mathbb Z}{\mathbb Q}.

This is a filtered, relative logarithmic crystalline analogue of the hard Lefschetz theorem. The supplied text attributes the conjecture to the author's earlier work and gives no evidence that it has been resolved.

Sources & referencesView supporting material

Primary source

Yukiyoshi Nakkajima, “Hirsch weight-filtered log crystalline complex and Hirsch weight-filtered log crystalline dga of a proper SNCL scheme in characteristic p>0”, arXiv:2012.12981 (2025).

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