The abelian Iwasawa main conjecture for CM fields

From papers

Let FF be a CM field and let ρ ⁣:GFAutE(Vρ)\rho\colon G_F\to\operatorname{Aut}_{\mathcal{E}}(V_\rho) be an Artin representation such that the field FρF_\rho corresponding to the kernel of ρ\rho is linearly disjoint from FmaxF_{\max}. Let O\mathcal{O} be the ring of integers of E\mathcal{E}. Choose a GFG_F-stable O\mathcal{O}-lattice TT of VρV_\rho and set A=TZpQp/ZpA=T\otimes_{\mathbb{Z}_p}\mathbb{Q}_p/\mathbb{Z}_p. Let SelA,ΣF(Fmax)\operatorname{Sel}_{A,\Sigma_F}(F_{\max}) be the Selmer group defined above.

Iwasawa main conjecture for ψ\psi. In the abelian case, for a finite Hecke character ψgal ⁣:GFAutEVψ\psi^{\mathrm{gal}}\colon G_F\to\operatorname{Aut}_{\mathcal{E}}V_\psi with FψF_\psi linearly disjoint from FmaxF_{\max}, the equality

(Lp,ΣF(ψ))=charO^ur[[ΓF,max]](SelAψ,ΣF(Fmax)^OO^ur)(L_{p,\Sigma_F}(\psi))=\operatorname{char}_{\widehat{\mathcal{O}}^{\mathrm{ur}}[[\Gamma_{F,\max}]]}\bigl(\operatorname{Sel}_{A_\psi,\Sigma_F}(F_{\max})^\vee\widehat{\otimes}_{\mathcal{O}}\widehat{\mathcal{O}}^{\mathrm{ur}}\bigr)

of principal ideals of O^ur[[ΓF,max]]\widehat{\mathcal{O}}^{\mathrm{ur}}[[\Gamma_{F,\max}]] should hold, where Lp,ΣF(ψ)L_{p,\Sigma_F}(\psi) is the pp-adic Hecke LL-function defined as in the cited theorem. The Pontryagin dual of the Selmer group is pseudo-isomorphic to the corresponding Iwasawa module, and this conjecture is equivalent to the main conjecture proposed by Hida and Tilouine.

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Sources & referencesView supporting material

Primary source

Takashi Hara and Tadashi Ochiai, “On the p-adic L-function and Iwasawa Main Conjecture for an Artin motive over a CM field”, arXiv:2407.06983 (2025).

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