Ihara's lemma for Shimura curves with arbitrary weight

Let FF be a totally real field, let DD be a quaternion algebra over FF ramified at exactly one infinite place, and let p\mathfrak{p} be a finite place at which DD is unramified. Let KG(AF,f)K\subseteq G(\mathbb{A}_{F,f}) be sufficiently small and unramified at p\mathfrak{p}, let SS contain Σ(K)Σl{p}Σ\Sigma(K)\cup\Sigma_l\cup\{\mathfrak{p}\}\cup\Sigma_\infty, and let π1,π2:XK0(p)XK\pi_1,\pi_2:X_{K_0(\mathfrak{p})}\to X_K be the degeneracy maps. Let Λ\Lambda be the local system on XKX_K attached to a finite-dimensional continuous Fl\mathbb{F}_l-representation of KpK^{\mathfrak{p}}. Ihara's lemma for arbitrary weight. For every non-Eisenstein maximal ideal m\mathfrak{m} of TZlS\mathbb{T}^S_{\mathbb{Z}_l}, the map

π1π2:Heˊt1(XK,Λ)mHeˊt1(XK,Λ)mHeˊt1(XK0(p),Λ)m\pi_1^*\oplus\pi_2^*:H^1_{\mathrm{\acute{e}t}}(X_K,\Lambda)_\mathfrak{m}\oplus H^1_{\mathrm{\acute{e}t}}(X_K,\Lambda)_\mathfrak{m}\longrightarrow H^1_{\mathrm{\acute{e}t}}(X_{K_0(\mathfrak{p})},\Lambda)_\mathfrak{m}

is injective. This is the expected Ihara lemma for Shimura curves with coefficients in arbitrary algebraic local systems; the constant-sheaf case is the weight-two specialization, and the statement remains conjectural in the generality considered here.

Sources & referencesView supporting material

Primary source

Jeff Manning and Jack Shotton, “Ihara's lemma for Shimura curves over totally real fields via patching”, arXiv:1907.06043 (2020).

Progress summary

Never refreshed

Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.

Solutions 0

No solutions have been posted yet.