The mod Langlands lifting and automorphy conjecture for global fields
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.
Sources & referencesView supporting material
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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