Jannsen's local vanishing conjecture

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 Heti(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),Heti(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.

Sources & referencesView supporting material

Primary source

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

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