Multiplicity-one conjecture for localized new homology

Let ρ:GFGL2(k)\overline{\rho}:G_F\rightarrow\operatorname{GL}_2(k) be an absolutely irreducible Galois representation, let m\mathfrak{m} be the associated maximal ideal, and let dFd_F be the discriminant of FF. Assume that pp divides neither 22 nor dFd_F, and that for every qS\mathfrak{q}\in S, either ρGq\overline{\rho}|G_{\mathfrak{q}} is ramified at q\mathfrak{q}, or it is unramified there and ρ(Frobq)\overline{\rho}(\operatorname{Frob}_{\mathfrak{q}}) is not scalar. Multiplicity-one conjecture. Then

H1(Y(KΣ),Z)mnewH_1(Y(K_{\Sigma}),\mathbf{Z})^{\mathrm{new}}_{\mathfrak{m}}

is free of rank one over

Tmnew.\mathbf{T}^{\mathrm{new}}_{\mathfrak{m}}.

This is a localized multiplicity-one statement; the source notes that failures of multiplicity one can arise from local phenomena, especially at primes above 22.

Sources & referencesView supporting material

Primary source

Frank Calegari and Akshay Venkatesh, “A torsion Jacquet–Langlands correspondence”, arXiv:1212.3847 (2012).

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