Steingart's surjectivity conjecture for Lubin–Tate Iwasawa cohomology

Let LL be a finite extension of Qp\mathbb{Q}_p, let SS be a representation of GLG_L, and let S(1)S^*(1) be LL-analytic. Write τ=χLT1χcyc\tau=\chi_{\mathrm{LT}}^{-1}\chi_{\mathrm{cyc}}, let Λ\Lambda be the Iwasawa algebra, let ΛL\Lambda_\infty^L be the LL-analytic distribution algebra, and let Drig(S(τ1))D^{\dagger}_{\operatorname{rig}}(S(\tau^{-1})) be the associated Robba-ring (φ,Γ)(\varphi,\Gamma)-module with operator Ψ\Psi. The comparison map is

comp:RΓIw(L/L,S)ΛΛLDrig(S(τ1))[Ψ1].\operatorname{comp}:R\Gamma_{\mathrm{Iw}}(L_\infty/L,S)\otimes_\Lambda\Lambda_\infty^L\longrightarrow D^{\dagger}_{\operatorname{rig}}(S(\tau^{-1}))[\Psi-1].

Steingart's surjectivity conjecture. The map comp\operatorname{comp} is surjective after taking H1H^1, namely

HIw1(L/L,S)ΛΛLDrig(S(τ1))Ψ=1.H^1_{\mathrm{Iw}}(L_\infty/L,S)\otimes_\Lambda\Lambda_\infty^L\twoheadrightarrow D^{\dagger}_{\mathrm{rig}}(S(\tau^{-1}))^{\Psi=1}.

In the classical case L=QpL=\mathbb{Q}_p, the comparison map is known to be a quasi-isomorphism, whereas for LQpL\ne\mathbb{Q}_p it is not a quasi-isomorphism in general. The conjecture asserts that surjectivity nevertheless survives on H1H^1; proving it in this generality remains open.

Sources & referencesView supporting material

Primary source

Muhammad Manji, “Iwasawa Theory for GU(2,1) at inert primes”, arXiv:2409.05664 (2025).

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