Locally analytic de Rham criterion for completed cohomology representations

Let LL be the local field appearing in the construction, let EE be a finite extension of LL containing all embeddings of LL into Qp\overline{\mathbb{Q}}_p, and let

ρ:GalFGL2(E)\rho:\operatorname{Gal}_F\longrightarrow \operatorname{GL}_2(E)

be a two-dimensional continuous absolutely irreducible representation. Let Π(ρ)\Pi(\rho) be the associated unitary Banach representation of GL2(L)\operatorname{GL}_2(L), and assume Π(ρ)0\Pi(\rho)\neq 0. For a subset JJ of the embeddings of LL into EE, write JcJ^c for its complement, and let Π(ρ)Jc-la,J-lalg\Pi(\rho)^{J^c\textup{-la},J\textup{-lalg}} denote the corresponding partially locally analytic, partially locally algebraic vectors. Locally analytic de Rham criterion. For every such subset JJ,

Π(ρ)Jc-la,J-lalg0\Pi(\rho)^{J^c\textup{-la},J\textup{-lalg}}\neq 0

if and only if ρ\rho is JJ-de Rham with distinct JJ-Hodge--Tate weights. This conjecture is intended to characterize the de Rham properties of ρ\rho through locally analytic vectors in completed cohomology; it refines the known implication from appropriate locally algebraic vectors to de Rham representations and would give a criterion for partial de Rhamness in every set of embeddings.

Sources & referencesView supporting material

Primary source

Tian Qiu and Benchao Su, “Locally analytic vectors in the completed cohomology of unitary Shimura curves”, arXiv:2505.10290 (2025).

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