Unramifiedness and nilpotent ramification conjecture for Hilbert modular cohomology

Let FF be a totally real number field of degree gg over Q\mathbb{Q} and let pp be an arbitrary prime number. Fix a prime p\mathfrak{p} of FF lying above pp, and let κp=((kτ)τΣ,w)\kappa_\mathfrak{p}=((k_\tau)_{\tau\in\Sigma},w) be a paritious weight such that kτ=1k_\tau=1 for all τΣp\tau\in\Sigma_\mathfrak{p}. Let T\mathbb{T} denote the image of the universal tame Hecke algebra acting on

H(Shtor,E/OOωκp(D)),H^\bullet(\operatorname{Sh}^{\operatorname{tor}},E/\mathcal{O}\otimes_\mathcal{O}\omega^{\kappa_\mathfrak{p}}(-\mathtt{D})),

and let m\mathfrak{m} denote a non-Eisenstein maximal ideal of T\mathbb{T}, with associated Galois representation ρˉ\bar\rho. Let RpR_\mathfrak{p} denote the universal ring for framed O\mathcal{O}-deformations of ρˉGp\bar\rho|_{G_\mathfrak{p}}, and let I\mathscr{I} be the proper ideal of RpR_\mathfrak{p} cutting out the locus of unramified lifts.

Unramifiedness and nilpotent ramification conjecture. The representation ρˉ\bar\rho is unramified at p\mathfrak{p}, and there exists a positive integer nn depending on gg such that In\mathscr{I}^n annihilates the RpR_\mathfrak{p}-module

H(Shtor,E/OOωκp(D))m.H^\bullet(\operatorname{Sh}^{\operatorname{tor}},E/\mathcal{O}\otimes_\mathcal{O}\omega^{\kappa_\mathfrak{p}}(-\mathtt{D}))_\mathfrak{m}.

This is motivated by the expected properties of modular Galois representations arising from forms of weight (1,,1)(1,\ldots,1). It predicts both unramifiedness of the residual representation at p\mathfrak{p} and a uniform nilpotence statement for the ramified deformation directions acting on the localized cohomology. The source does not indicate whether the conjecture has been resolved.

Sources & referencesView supporting material

Primary source

Matthew Emerton, Davide A. Reduzzi and Liang Xiao, “Unramifiedness of Galois representations arising from Hilbert modular surfaces”, arXiv:1410.6203 (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.