Arithmetic Poincaré duality for pro-étale cohomology of Stein dagger varieties

Let KK be the base field, and let XX be a smooth Stein dagger variety over KK, geometrically irreducible and of dimension dd. Write Hproeˊti(X,Qp(j))H^i_{\operatorname{pro\acute{e}t}}(X,\mathbf{Q}_p(j)) and Hproeˊt,ci(X,Qp(j))H^i_{\operatorname{pro\acute{e}t},c}(X,\mathbf{Q}_p(j)) for pro-étale cohomology with and without compact support, and let D()=RHomQp(,Qp)\mathbb D(-)={\mathrm R}\underline{\operatorname{Hom}}_{\mathbf{Q}_p}(-,\mathbf{Q}_p). Arithmetic Poincaré duality conjecture. The groups Hproeˊti(X,Qp(j))H^i_{\operatorname{pro\acute{e}t}}(X,\mathbf{Q}_p(j)) and Hproeˊt,ci(X,Qp(j))H^i_{\operatorname{pro\acute{e}t},c}(X,\mathbf{Q}_p(j)) are nuclear Fréchet and of compact type, respectively, and there are (quasi-)isomorphisms in D(Qp,)\mathcal{D}(\mathbf{Q}_{p,\Box}):

RΓproeˊt(X,Qp(j))D(RΓproeˊt,c(X,Qp(d+1j))[2d+2]),{\mathrm R}\Gamma_{\operatorname{pro\acute{e}t}}(X,\mathbf{Q}_p(j))\simeq \mathbb D\bigl({\mathrm R}\Gamma_{\operatorname{pro\acute{e}t},c}(X,\mathbf{Q}_p(d+1-j))[2d+2]\bigr), Hproeˊti(X,Qp(j))Hproeˊt,c2d+2i(X,Qp(d+1j)),H^i_{\operatorname{pro\acute{e}t}}(X,\mathbf{Q}_p(j))\simeq H^{2d+2-i}_{\operatorname{pro\acute{e}t},c}(X,\mathbf{Q}_p(d+1-j))^*, Hproeˊt,ci(X,Qp(j))Hproeˊt2d+2i(X,Qp(d+1j)).H^i_{\operatorname{pro\acute{e}t},c}(X,\mathbf{Q}_p(j))\simeq H^{2d+2-i}_{\operatorname{pro\acute{e}t}}(X,\mathbf{Q}_p(d+1-j))^*.

This is proposed as an arithmetic Poincaré duality extending the dimension-one duality established earlier in the paper to smooth Stein dagger varieties of arbitrary dimension. The status of the functional-analytic assertions and the duality in this generality is not resolved in the supplied text.

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Primary source

Pierre Colmez, Sally Gilles and Wiesława Nizioł, “Arithmetic duality for p-adic pro-étale cohomology of analytic curves”, arXiv:2308.07712 (2023).

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