Breuil's companion-points conjecture for definite unitary eigenvarieties

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Let TpT_p be the relevant diagonal torus, let E(Up)ρ‾\mathcal E(U^p)_{\overline\rho} be the eigenvariety attached to the definite unitary group, and retain the notation for S2∣Sp∣\mathcal S_2^{|S_p|}, the classical points zs=(mρ,δs)z_s=(\mathfrak m_\rho,\delta_s), the subsets Σ(zs)v~\Sigma(z_s)_{\widetilde v}, the companion characters (δs)Jc(\delta_s)_J^c, and the weight notation λ‾Σp∖J\underline\lambda_{\Sigma_p\setminus J}. Breuil's conjecture. (1) For a character χ:Tp→E×\chi:T_p\rightarrow E^{\times}, (mρ,χ)∈E(Up)ρ‾(\mathfrak m_\rho,\chi)\in\mathcal E(U^p)_{\overline\rho} if and only if there exist s∈S2∣Sp∣s\in\mathcal S_2^{|S_p|} and J⊆Σ(zs)v~J\subseteq\Sigma(z_s)_{\widetilde v} such that χ=(δs)Jc\chi=(\delta_s)_J^c. (2) For s∈S2∣Sp∣s\in\mathcal S_2^{|S_p|} and J⊆Σ(zs)J\subseteq\Sigma(z_s), the point (zs)Jc:=(mρ,(δs)Jc)(z_s)_J^c:=(\mathfrak m_\rho,(\delta_s)_J^c) lies moreover in E(Up,λ‾Σp∖J)ρ‾\mathcal E(U^p,\underline\lambda_{\Sigma_p\setminus J})_{\overline\rho}. This is the eigenvariety formulation equivalent to the locally analytic socle statement and predicts all companion points together with their expected classicality weights. The source supplies no resolution evidence for this formulation.

References

Primary source

Yiwen Ding, “Companion points and locally analytic socle for GL_2(L)”, arXiv:1602.08859 (2019).

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