Unramifiedness and nilpotent ramification conjecture for Hilbert modular cohomology

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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)τ∈Σ,w)\kappa_\mathfrak{p}=((k_\tau)_{\tau\in\Sigma},w) be a paritious weight such that kτ=1k_\tau=1 for all τ∈Σp\tau\in\Sigma_\mathfrak{p}. Let T\mathbb{T} denote the image of the universal tame Hecke algebra acting on

H∙(Sh⁡tor⁡,E/O⊗Oωκp(−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 ρˉ∣Gp\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∙(Sh⁡tor⁡,E/O⊗Oωκp(−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.

References

Primary source

Matthew Emerton, Davide A. Reduzzi and Liang Xiao, “Unramifiedness of Galois representations arising from Hilbert modular surfaces”, arXiv:1410.6203 (2017).

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