Generalized Emerton factorization conjecture for completed cohomology

Let LL be the coefficient field, let pp be a prime, and let ρ:GQGL2(L)\rho:{\cal G}_{\bf Q}\to {\bf GL}_2(L) be an odd representation. For a finite set SS of primes, write H^1\widehat H^1 for the completed cohomology representation, let LLp(ρ){\rm LL}_p(\rho_\ell) denote the pp-adic local Langlands representation at each S\ell\in S, and let G(AfS){\mathbb G}({\bf A}_f^S) be the finite adèlic group away from SS and pp as defined in the source.

Generalized Emerton conjecture. For every finite set SS, there is a factorization

HomGQ(ρ,H^1)(S^LLp(ρ))^ΠpS(ρ),{\rm Hom}_{{\cal G}_{\bf Q}}(\rho,\widehat H^1)\cong \Big(\,\widehat{\bigotimes_{\ell\in S}}\,{\rm LL}_p(\rho_\ell)\Big)\,\widehat\otimes\Pi^S_p(\rho),

where ΠpS(ρ)\Pi^S_p(\rho) is a continuous representation of G(AfS){\mathbb G}({\bf A}_f^S).

This is proposed as a generalization of the preceding Emerton conjecture, replacing the pp-adic completed cohomology statement by a factorization valid for every finite set of places. The source presents it as a tentative generalization and gives no resolution, so it remains open.

Sources & referencesView supporting material

Primary source

Pierre Colmez, “Exercices adéliques”, arXiv:2402.16231 (2024).

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