Almost unramified automorphic representations for split groups over Fq(t)

ALMOST UNRAMIFIED DISCRETE SPECTRUM FOR SPLIT GROUPS OVER Fq(t)

Let G be a split adjoint group defined over Fq , let F = Fq(t), and let A be the adèles of F. We describe the local constituents at two points of automorphic representations of G in the discrete part of L2(G(F)\G(A)) which have vectors invariant under Iwahori subgroups at these two points and are unramified at all other points.

Unramified Representations of Reductive Groups over Finite Rings

Lusztig has given a construction of certain representations of reductive groups over finite local principal ideal rings of characteristic p, extending the construction of Deligne and Lusztig of representations of reductive groups over finite fields. We generalize Lusztig’s results to reductive groups over arbitrary finite local rings. This generalization uses the Greenberg functor and the theor...

Automorphic Representations of Adele Groups

Spherical unitary representations for split groups

1. Basic examples.

Automorphic representations with prescribed ramification for unitary groups

Let F be a totally real number field, n a prime integer, and G a unitary group of rank n defined over F that is compact at infinity. We prove an asymptotic formula for the number of automorphic representations of G whose factors at finitely many places are prescribed up to inertia. These factors are specified by local inertial types, and the proof relies crucially on a bound on the traces of th...