Local-global compatibility for automorphic Galois representations

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Let FF be a number field, let π=⊗v′πv\pi=\otimes'_v\pi_v be an algebraic cuspidal automorphic representation of GL⁡n(AF)\operatorname{GL}_n(\mathbb{A}_F), let ll be a rational prime, and fix an isomorphism ι:Q‾l→∼C\iota:\overline{\mathbb{Q}}_l\xrightarrow{\sim}\mathbb{C}. For each finite place vv of FF, write rec⁡Fv\operatorname{rec}_{F_v} for the local Langlands correspondence and, conjecturally, let rι(π):GF→GL⁡n(Q‾l)r_\iota(\pi):G_F\to\operatorname{GL}_n(\overline{\mathbb{Q}}_l) be the continuous semisimple Galois representation attached to π\pi. For v∤lv\nmid l, its restriction gives the Frobenius-semisimplified Weil--Deligne representation WD⁡(rι(π)∣GFv)F-ss⁡⊗ιC\operatorname{WD}(r_\iota(\pi)|_{G_{F_v}})^{\operatorname{F-ss}}\otimes_\iota\mathbb{C}. Local-global compatibility conjecture. For all finite places vv of FF, we have

WD⁡(rι(π)∣GFv)F-ss⁡⊗ιC≅rec⁡Fv(πv⊗∣det⁡∣1−n2).\operatorname{WD}(r_\iota(\pi)|_{G_{F_v}})^{\operatorname{F-ss}}\otimes_\iota\mathbb{C}\cong\operatorname{rec}_{F_v}(\pi_v\otimes|\det|^{\frac{1-n}{2}}).

This predicts that the local Weil--Deligne representation attached to the automorphic representation agrees with the one obtained from its global Galois representation. The paper proves a new ordinary rank-two case over CM fields, while the statement in this generality is not established.

References

Primary source

Yuji Yang, “An Ordinary Rank-Two Case of Local-Global Compatibility for Automorphic Representations of Arbitrary Weight Over CM Fields”, arXiv:2111.00318 (2024).

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