Multiplicity-one conjecture for localized new homology

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Let ρ‾:GF→GL⁡2(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 q∈S\mathfrak{q}\in S, either ρ‾∣Gq\overline{\rho}|G_{\mathfrak{q}} is ramified at q\mathfrak{q}, or it is unramified there and ρ‾(Frob⁡q)\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.

References

Primary source

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

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