The integral Tate conjecture for separably rationally connected varieties in codimension one

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Let XX be a smooth projective variety over a finite field, and let d=dim⁡Xd=\dim X. Say that XX is separably rationally connected in codimension 11 if it admits a morphism f:P1→Xf:\mathbb{P}^1\to X such that, in the splitting f∗TX=⨁iO(ai)f^*T_X=\bigoplus_i\mathcal{O}(a_i), all ai≥0a_i\geq 0 and all but one are strictly positive. Integral Tate conjecture. If XX is separably rationally connected in codimension 11, then

CH1(X)⊗Zℓ⟶Heˊt2d−2(X,Zℓ(d−1))CH_1(X)\otimes\mathbb{Z}_\ell\longrightarrow H^{2d-2}_{\text{ét}}(X,\mathbb{Z}_\ell(d-1))

is surjective. This is motivated by the failure of the integral cycle class map to be surjective in general, and the source presents it as a conjectural consequence of the paper's results and earlier work.

References

Primary source

Zhiyu Tian, “Local-global principle and integral Tate conjecture for certain varieties”, arXiv:2211.15915 (2024).

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