Integral and compatible Satake parameters for discrete automorphic representations

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Let GG be a connected reductive group over a global function field KK, let U⊂G(AK)U\subset G(\mathbf A_K) be open compact, let EE be a noetherian Z[1p]\mathbb Z[\frac1p]-algebra embedded in an algebraically closed field CC, and let CAdisc(G,U,E){{\mathbb C} A}_{disc}(G,U,E) be the discrete automorphic forms with coefficients in EE. For a discrete automorphic representation belonging to a semisimple Langlands parameter σ\sigma, and for an unramified place w∉S(U)w\notin S(U), let sw,ℓ(σ)s_{w,\ell}(\sigma) be the Satake parameter corresponding to the Hecke character, let αw(σ)=[σ(Frobw)]\alpha_w(\sigma)=[\sigma(\mathsf{Frob}_w)], and let ιℓ\iota_\ell be the comparison embedding. Lafforgue's conjecture. (i) The discrete spectrum admits the excursion-operator decomposition described in the source. (ii) For fixed σ\sigma, there is an sw(σ)s_w(\sigma) such that

sw,ℓ(σ)=ιℓ(sw(σ)),αw(σ)=sw(σ).s_{w,\ell}(\sigma)=\iota_\ell(s_w(\sigma)),\qquad \alpha_w(\sigma)=s_w(\sigma).

The source notes that this is known for cuspidal representations; the conjectural content concerns the discrete spectrum.

References

Primary source

Dan Ciubotaru and Michael Harris, “On the generalized Ramanujan and Arthur conjectures over function fields”, arXiv:2311.15300 (2023).

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