The mod Langlands lifting and automorphy conjecture for global fields
Let be a global field of characteristic different from . Let be a connected reductive group, and let be the split group over whose root datum is dual to that of . Let be a finite set of primes of , containing all primes above when is a number field, and let
be a continuous representation unramified outside . If is a number field, assume further that it is totally real and that is odd. Mod Langlands lifting and automorphy conjecture. There is a lift
of to the ring of integers in some finite extension of inside , unramified outside a finite set of primes, with Zariski-dense image in and, in the number field case, regular Hodge--Tate cocharacters. There are also an -algebraic cuspidal automorphic representation of and an isomorphism such that the conjectural Galois representation
associated to is isomorphic to . Moreover, if is absolutely irreducible, and can be taken to be unramified outside . In the function field case, the automorphic Galois representation construction is known by V. Lafforgue for general ; in the number field case, the conjecture concerns automorphic Galois representations expected to have regular infinitesimal character, and remains open in general.
References
Primary source
Najmuddin Fakhruddin, Chandrashekhar Khare and Stefan Patrikis, “Lifting and automorphy of reducible mod p Galois representations over global fields”, arXiv:2008.12593 (2021).
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