Weight-detection conjecture for étale homology

Let XX be a scheme, let MM be a compact Voevodsky motive over XX, and let nge0nge 0. Write DMc(X)wChowgenDM_c(X)_{{w_{Chow}}ge -n} for the nonnegative part of the Chow weight structure, and let HQletH^{et}_{{\mathbb{Q}_l}} be the rational ll-adic étale homology theory. For p,qZp,q\in\mathbb{Z}, let E2pqTwChow(X)(HQlet,M)E_2^{pq}T_{{w_{Chow}}(X)}(H^{et}_{{\mathbb{Q}_l}},M) denote the corresponding weight spectral sequence terms.

Weight-detection conjecture. For every r,n0r,n\ge 0, if

E2pqTwChow(X)(HQlet,M)=0E_2^{pq}T_{{w_{Chow}}(X)}(H^{et}_{{\mathbb{Q}_l}},M)=0

for all qZq\in\mathbb{Z} and p>np>n, then MDMc(X)wChownM\in DM_c(X)_{{w_{Chow}}\ge -n}. The restricted assertion WDrn(X)WD_r^n(X) is that the same implication holds under the additional assumption MN~r(X)M\in\widetilde{N}_r(X).

This conjecture proposes detecting lower bounds for the Chow weight of a motive through vanishing of the higher terms of its étale weight spectral sequence. The source formulates both the unrestricted and the N~r(X)\widetilde{N}_r(X)-restricted versions, but gives no resolution status.

Sources & referencesView supporting material

Primary source

Mikhail V. Bondarko and Alexander Yu. Luzgarev, “On relative K-motives, weights for them, and negative K-groups”, arXiv:1605.08435 (2017).

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