The logarithmic Chow–Künneth decomposition conjecture

Let XX be a projective vertical log smooth fs log scheme of relative dimension dd over SS, and let h(X)h(X) be its log motive in the category LM(S)\mathrm{LM}(S) of log motives. Write hi(X)h^i(X)_{\ell} for the \ell-adic realization of a summand and Hi(X)H^i(X)_{\ell} for the ii-th \ell-adic cohomology sheaf.

Logarithmic Chow–Künneth conjecture. The motive h(X)h(X) should admit a decomposition

h(X)=h0(X)h1(X)h2d(X)h(X)=h^0(X)\oplus h^1(X)\oplus\dots\oplus h^{2d}(X)

in LM(S)\mathrm{LM}(S) such that hi(X)=Hi(X)h^i(X)_{\ell}=H^i(X)_{\ell}.

This predicts a cohomologically graded decomposition of the log motive, analogous to a Chow–Künneth decomposition. The source provides no resolution status.

Sources & referencesView supporting material

Primary source

Tetsushi Ito, Kazuya Kato, Chikara Nakayama and Sampei Usui, “On log motives”, arXiv:1712.09815 (2017).

Progress summary

Never refreshed

Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.

Solutions 0

No solutions have been posted yet.