Tate-Beilinson-Parshin cycle map conjecture

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Let kk be a finite field, let k‾\overline{k} be a separable closure, and let GkG_k be its Galois group. Let XX be a projective smooth variety over kk, let ℓ\ell be a prime different from the characteristic of kk, and let CH⁡i(X,j)\operatorname{CH}^i(X,j) denote Bloch's higher Chow group. Set X‾=X×kk‾\overline{X}=X\times_k\overline{k}. Tate-Beilinson-Parshin cycle map conjecture. For all integers i,j≥0i,j\geq0, the cycle map

CH⁡i(X,j)⊗Qℓ⟶H2i−j(X‾,Qℓ(i))Gk\operatorname{CH}^i(X,j)\otimes\mathbb{Q}_{\ell}\longrightarrow H^{2i-j}(\overline{X},\mathbb{Q}_{\ell}(i))^{G_k}

is bijective. The paper explains that this combines the Tate-Beilinson and Parshin conjectures and holds for varieties in the class of projective smooth varieties of Abelian type for which the Tate conjecture holds; it remains open in general.

References

Primary source

Rin Sugiyama, “Tate conjecture for products of Fermat varieties over finite fields”, arXiv:1201.4207 (2012).

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