Comparison conjecture for étale and logarithmic étale motives

Let kk be a field and let Λ\Lambda be the coefficient ring. Denote by DMlog,eˊteff(k,Λ)\operatorname{DM}^{\mathrm{eff}}_{\log,\acute{e}t}(k,\Lambda) and DMlog,leˊteff(k,Λ)\operatorname{DM}^{\mathrm{eff}}_{\log,l\acute{e}t}(k,\Lambda) the effective logarithmic motive categories for the étale and logarithmic étale topologies, respectively.

Étale comparison conjecture. There is an equivalence of triangulated categories

DMlog,eˊteff(k,Λ)DMlog,leˊteff(k,Λ).\operatorname{DM}^{\mathrm{eff}}_{\log,\acute{e}t}(k,\Lambda)\cong \operatorname{DM}^{\mathrm{eff}}_{\log,l\acute{e}t}(k,\Lambda).

The conjecture is motivated by comparison results for Hodge sheaves, while the failure of strict homotopy invariance for Z/n\mathbb{Z}/n in the strict étale topology leaves the comparison of torsion cohomology unresolved.

Sources & referencesView supporting material

Primary source

Federico Binda, Doosung Park and Paul Arne Østvær, “Triangulated categories of logarithmic motives over a field”, arXiv:2004.12298 (2021).

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