ℓ-adic integral Tate conjecture in codimension c

Let XX be a smooth projective variety over the algebraic closure kk of a finitely generated field, and let char(k)\ell\neq\operatorname{char}(k) be a prime. The target of the cycle class map is the Tate submodule

H2c(X,Z(c))Tate.\mathrm{H}^{2c}(X,\mathbf{Z}_{\ell}(c))^{\mathrm{Tate}}.

ℓ-adic integral Tate conjecture in codimension cc. The cycle class map

CHc(X)ZH2c(X,Z(c))Tate\operatorname{CH}^c(X)\otimes\mathbf{Z}_{\ell}\to \mathrm{H}^{2c}(X,\mathbf{Z}_{\ell}(c))^{\mathrm{Tate}}

is surjective.

The paper discusses counterexamples to the integral Tate conjecture, so the general assertion is refuted.

Sources & referencesView supporting material

Primary source

Aise Johan de Jong and Alexander Perry, “The period-index problem and Hodge theory”, arXiv:2212.12971 (2022).

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