Diamond–Sasaki geometric modularity conjecture

Let FF be a totally real field in which pp is unramified, let GFG_F be its absolute Galois group, and let Σv\Sigma_v denote the embeddings associated with a place vpv\mid p. Let Ξmin+\Xi_{\min}^{+} be the set of weights specified by Diamond and Sasaki. Suppose that ρ:GFGL2(Fp)\rho:G_F\to\operatorname{GL}_2(\overline{\mathbb F}_p) is geometrically modular of some weight. Diamond–Sasaki's geometric modularity conjecture. If kΞmin+k\in\Xi_{\min}^{+}, then ρ\rho is geometrically modular of weight (k,l)(k,l) if and only if, for every vpv\mid p, the restriction ρGFv\rho|_{G_{F_v}} has a crystalline lift of weight (kτ,lτ)τΣv(k_{\tau},l_{\tau})_{\tau\in\Sigma_v}. This remains open.

Sources & referencesView supporting material

Primary source

Hanneke Wiersema, “Crystalline liftability of irregular weights”, arXiv:2506.21637 (2025).

Additional references

2 papers in this index state this conjecture (2017–2025). The statement above is taken from the most recent of them; the others are arXiv:1712.03775.

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