The intersection-cohomology ordinariness conjecture

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Let XX be a projective variety over a number field FF, let nn be an integer, and let FsF^s be a separable closure of FF. For every prime number ℓ\ell, consider the Newton polygon NP⁡(Frob⁡p∣IHn(X⊗FFs,Qℓ))\operatorname{NP}(\operatorname{Frob}_{\mathfrak{p}}|_{IH^n(X\otimes_FF^s,\mathbb{Q}_{\ell})}) and the Hodge–Tate polygon HTP⁡(IHn(X⊗FFs,Qℓ))\operatorname{HTP}(IH^n(X\otimes_FF^s,\mathbb{Q}_{\ell})).

Intersection-cohomology ordinariness conjecture. For every prime number ℓ\ell, there exists an infinite set of maximal ideals p\mathfrak{p} of OF\mathscr{O}_F with residue characteristic different from ℓ\ell such that

NP⁡(Frob⁡p∣IHn(X⊗FFs,Qℓ))=HTP⁡(IHn(X⊗FFs,Qℓ)).\operatorname{NP}(\operatorname{Frob}_{\mathfrak{p}}|_{IH^n(X\otimes_FF^s,\mathbb{Q}_{\ell})})=\operatorname{HTP}(IH^n(X\otimes_FF^s,\mathbb{Q}_{\ell})).

This is presented as the analogue of the ordinariness conjecture for intersection cohomology. The source provides partial verification in special motivic settings but no general resolution.

References

Primary source

Junecue Suh, “Ordinary primes in Hilbert modular varieties”, arXiv:2410.01182 (2024).

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