Homologically trivial cycles are admissible cycles

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Let XX be a smooth projective variety over the finitely generated field KK, and let CHli(X)CH^i_l(X) denote the subgroup of cycles homologically equivalent to zero for ll-adic cohomology, where l≠char⁡kl\ne\operatorname{char} k. Let CHi(X)(0)CH^i(X)^{(0)} be the subgroup of admissible cycles defined in Proposition 7. Homological admissibility conjecture. One has the inclusion

CHli(X)⊆CHi(X)(0).CH^i_l(X)\subseteq CH^i(X)^{(0)}.

The paper states this inclusion as a consequence of the numerical equivalence conjecture. Its general validity is therefore unresolved unless that preceding conjecture is established.

References

Primary source

Bruno Kahn and with an appendix by Qing Liu, “Refined height pairing”, arXiv:2009.00533 (2023).

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