Iwasawa's main conjecture for definite and indefinite Rankin–Selberg eigenvarieties

Let V\mathbf{V} be a datum with m=\mathfrak{m}=\emptyset, let ξ=(ξn,ξn+1)\xi=(\xi^n,\xi^{n+1}) be a pair of Σp++\Sigma^+_p\setminus\lozenge^+-trivial dominant hermitian weights, let γ\gamma be as specified in the source, and let J<I0\mathrm{J}<\mathrm{I}^0 be a subgroup. Assume that γ\gamma satisfies (G1), and also (G2) when V\mathbf{V} is indefinite, and fix a ξ\xi-distinction when ξ\xi is interlacing. Let E\mathscr{E}' be an irreducible component of the normal locus of SpecEJ(ξ,V)γ\operatorname{Spec}\mathscr{E}_\mathrm{J}(\xi,\mathbf{V})_\gamma. Iwasawa's main conjecture. If V\mathbf{V} is definite and λJ(V)\boldsymbol{\lambda}_\mathrm{J}(\mathbf{V}) is nonzero on E\mathscr{E}', then Hf1(F,RJ(ξ,V)γ)\mathrm{H}^1_f(F,\mathscr{R}_\mathrm{J}(\xi,\mathbf{V})_\gamma) vanishes over E\mathscr{E}', XJ(ξ,V)γ\mathscr{X}_\mathrm{J}(\xi,\mathbf{V})_\gamma is torsion over E\mathscr{E}', and

2charE(DJ(ξ,V)γH/λJ(V))=charE(XJ(ξ,V)γ).2\operatorname{char}_{\mathscr{E}'}\left(\mathscr{D}_\mathrm{J}(\xi,\mathbf{V})_\gamma^\mathsf{H}/\boldsymbol{\lambda}_\mathrm{J}(\mathbf{V})\right)=\operatorname{char}_{\mathscr{E}'}\left(\mathscr{X}_\mathrm{J}(\xi,\mathbf{V})_\gamma\right).

If V\mathbf{V} is indefinite and κJ(V)\boldsymbol{\kappa}_\mathrm{J}(\mathbf{V}) is nonzero on E\mathscr{E}', then both Hf1(F,RJ(ξ,V)γ)\mathrm{H}^1_f(F,\mathscr{R}_\mathrm{J}(\xi,\mathbf{V})_\gamma) and Hf1(F,DJ(ξ,V)γ)H\mathrm{H}^1_f(F,\mathscr{D}_\mathrm{J}(\xi,\mathbf{V})_\gamma)^\mathsf{H} have generic rank one over E\mathscr{E}', XJ(ξ,V)γ\mathscr{X}_\mathrm{J}(\xi,\mathbf{V})_\gamma has generic rank one over E\mathscr{E}', and

2\operatorname{char}_{\mathscr{E}'}\left(\mathrm{H}^1_f(F,\mathscr{D}_\mathrm{J}(\xi,\mathbf{V})_\gamma)^\mathsf{H}/\boldsymbol{\kappa}_\mathrm{J}(\mathbf{V})\right)=\operatorname{char}_{\mathscr{E}'}\left(\mathscr{X}_\mathrm{J}(\xi,\mathbf{V})_\gamma^\operatorname{tor}\right).

Here \mathscr{M}^\operatorname{tor} denotes the maximal torsion submodule over the normal locus. This is the eigenvariety analogue of Iwasawa's main conjecture, relating Bessel periods or cohomology classes to Selmer groups. The source states the conjectural equalities and rank or torsion assertions but gives no resolution status.

Sources & referencesView supporting material

Primary source

Yifeng Liu, “Bessel periods and Selmer groups over ordinary Rankin–Selberg eigenvariety”, arXiv:2412.18881 (2024).

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