Kahn's integral comparison conjecture for Weil motivic cohomology

Fix a smooth projective variety XX over Fq\mathbb{F}_q and an integer nn. For every prime ll, let cc be the comparison map from Weil-étale motivic cohomology to continuous ll-adic cohomology. Thus the relevant groups are HWi(X,Z(n))H^i_W(X,\mathbb{Z}(n)) and Hconti(X,Zl(n))H^i_{cont}(X,\mathbb{Z}_l(n)).

Kahn's conjecture. For every prime ll and any ii, the map cc induces an isomorphism

HWi(X,Z(n))ZlHconti(X,Zl(n)).H^i_W(X,\mathbb{Z}(n))\otimes\mathbb{Z}_l\xrightarrow{\sim}H^i_{cont}(X,\mathbb{Z}_l(n)).

This would make Weil motivic cohomology an integral model for both ll-adic and pp-adic cohomology. The source identifies it with Kahn's conjecture, but the supplied text does not state whether it has been resolved.

Sources & referencesView supporting material

Primary source

Thomas H. Geisser, “Weil-etale cohomology over finite fields”, arXiv:math/0404425 (2004).

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.