Ordinary implies ordinary Galois representations

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Let FF) be an imaginary quadratic field, let m\mathfrak{m} be a non-Eisenstein maximal ideal of residue characteristic p>2p>2 associated to a residual Galois representation ρ‾\overline{\rho}, and suppose that Tv∉mT_v\notin\mathfrak{m} for every v∣pv\mid p. Let L\mathcal{L} have parallel weight (k,k)(k,k) with k≥2k\geq 2, and let TQ,m\mathbf{T}_{Q,\mathfrak{m}} be the localized Hecke algebra. Ordinary ⇒\Rightarrow Ordinary. There exists a continuous Galois representation

ρ=ρm:GF⟶GL⁡2(TQ,m)\rho=\rho_{\mathfrak{m}}:G_F\longrightarrow \operatorname{GL}_2(\mathbf{T}_{Q,\mathfrak{m}})

with the following properties: for λ∉R∪Q∪{v∣p}∪S\lambda\notin R\cup Q\cup\{v\mid p\}\cup S, it is unramified at λ\lambda and the characteristic polynomial of ρ(Frob⁡λ)\rho(\operatorname{Frob}_{\lambda}) is

Y2−TλX+NF/Q(λ)k−1∈TQ,m[X];Y^2-T_{\lambda}X+N_{F/\mathbf{Q}}(\lambda)^{k-1}\in\mathbf{T}_{Q,\mathfrak{m}}[X];

for v∣pv\mid p, ρ∣Dv\rho|D_v is ordinary with eigenvalue the unit root of X2−TvX+N(v)k−1X^2-T_vX+N(v)^{k-1}; for v∈Rv\in R and v∈Sv\in S, its restriction to inertia is unipotent, with the stated Frobenius characteristic polynomial at v∈Sv\in S; for v∈Qv\in Q, under the stated invertibility, residual unramifiedness, and condition ϕ(Frob⁡v)≢±1(modm)\phi(\operatorname{Frob}_v)\not\equiv\pm1\pmod{\mathfrak{m}}, one has ρ∣Dv∼ϕϵ⊕ϕ−1\rho|D_v\sim\phi\epsilon\oplus\phi^{-1}; and if k=2k=2 and the level is prime to v∣pv\mid p, then ρ∣Dv\rho|D_v is finite flat. This asserts that the ordinary Hecke-theoretic data give rise to an ordinary Galois representation with the prescribed local properties. The statement is presented as the paper's main assumption on the existence of Galois representations; no resolution status is supplied in the source.

References

Primary source

Frank Calegari, “Semistable modularity lifting over imaginary quadratic fields”, arXiv:1907.08700 (2019).

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