Coefficient comparison conjecture for logarithmic and ordinary étale motives

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Let kk be a field, and suppose that Λ=Z/n\Lambda=\mathbb{Z}/n, where nn is invertible in kk. Let DM⁡log⁡,eˊteff\operatorname{DM}^{\mathrm{eff}}_{\log,\acute{e}t}, DM⁡log⁡,eˊt,propeff\operatorname{DM}^{\mathrm{eff}}_{\log,\acute{e}t,\mathrm{prop}}, DM⁡log⁡,leˊteff\operatorname{DM}^{\mathrm{eff}}_{\log,l\acute{e}t}, DM⁡log⁡,leˊt,propeff\operatorname{DM}^{\mathrm{eff}}_{\log,l\acute{e}t,\mathrm{prop}}, and DM⁡eˊteff\operatorname{DM}^{\mathrm{eff}}_{\acute{e}t} denote the corresponding effective motive categories, with the superscript prop\mathrm{prop} indicating the proper variant.

Coefficient comparison conjecture. There are equivalences of triangulated categories

DM⁡log⁡,eˊteff←DM⁡log⁡,eˊt,propeff→DM⁡eˊteff,\operatorname{DM}^{\mathrm{eff}}_{\log,\acute{e}t}\leftarrow \operatorname{DM}^{\mathrm{eff}}_{\log,\acute{e}t,\mathrm{prop}}\rightarrow \operatorname{DM}^{\mathrm{eff}}_{\acute{e}t},

and

DM⁡log⁡,leˊteff←DM⁡log⁡,leˊt,propeff→DM⁡eˊteff.\operatorname{DM}^{\mathrm{eff}}_{\log,l\acute{e}t}\leftarrow \operatorname{DM}^{\mathrm{eff}}_{\log,l\acute{e}t,\mathrm{prop}}\rightarrow \operatorname{DM}^{\mathrm{eff}}_{\acute{e}t}.

This predicts that both logarithmic étale theories compare with ordinary étale motives through their proper variants. The source presents it as an expectation and gives partial evidence, but no proof or disproof.

References

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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