Jannsen's local vanishing conjecture

About 19 years old · traced to

Let FF be a number field, let p\mathfrak{p} be a finite place, and let FpF_{\mathfrak{p}} be the completion of FF at p\mathfrak{p} with algebraic closure Fp‾\overline{F_{\mathfrak{p}}}. For the relevant étale cohomology representation Het⁡i(X‾,Ql(n))H^i_{\operatorname{et}}(\overline{X},\mathbb{Q}_l(n)), consider the absolute local Galois group Gal⁡(Fp‾/Fp)\operatorname{Gal}(\overline{F_{\mathfrak{p}}}/F_{\mathfrak{p}}). Jannsen's local conjecture. One should have

H2(Gal⁡(Fp‾/Fp),Het⁡i(X‾,Ql(n)))=0H^2(\operatorname{Gal}(\overline{F_{\mathfrak{p}}}/F_{\mathfrak{p}}),H^i_{\operatorname{et}}(\overline{X},\mathbb{Q}_l(n)))=0

if i+1<ni+1<n or i+1>2ni+1>2n. This is the local analogue of the global Jannsen conjecture; the source introduces it as an analogous conjecture and gives no resolution.

References

Primary source

Francesc Bars, “On Jannsen's conjecture for Hecke characters of imaginary quadratic fields”, arXiv:math/0703882 (2007).

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.