Automorphic Representation of Unitary Groups in Three by Jonathan David Rogawski

By Jonathan David Rogawski

The function of this booklet is to boost the reliable hint formulation for unitary teams in 3 variables. The solid hint formulation is then utilized to procure a type of automorphic representations. This paintings represents the 1st case during which the solid hint formulation has been labored out past the case of SL (2) and comparable teams. Many phenomena on the way to look within the basic case current themselves already for those unitary groups.

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Extra resources for Automorphic Representation of Unitary Groups in Three Variables

Example text

Let I be a regular element in T. 1, there exists 1' E H which is stably conjugate but not conjugate to I in G. (T, G) = Z/2. 8. Singular semisimple elements. Let G = U(3). For ~ E F*, let He be the unitary group in two variables defined by the Hermitian form: He The isomorphism class of depends only on ~ modulo NE* and we obtain a bijection between F* /NE* and the set of isomorphism classes of unitary groups in two variables over F with respect to E. The group H 1 is quasisplit and is isomorphic to U(2).

Let IP(T) be the set of unramified characters of T. (T, G)-orbit and every element of E"( G) is of the form 7r x for some x E Il"(T). Fix an element Wp E Wp whose projection to r(Fun /F) is the Frobenius element. (T, G) (and hence E"(G)) and the set of semisimple G- conjugacy classes in LG of the form {g x wp }. The conjugacy class {g(7r)} in LG associated to a representation 7r E E" ( G) is called the Langlands class of 7r. We can choose a representative g x wp with g E f. Let (H, s, T/) be an endoscopic datum for G.

Regular class in G. Suppose that 1' E TH. Then 1' is called ( G, H)-regular if a('ef;(I')) f. 1 for each root a of T which is not the image of a root of TH in H. Let 1' be a ( G, H)-regular element of TH. Suppose that 'lj; is defined over F (this entails no loss of generality since the choice of Tis arbitrary) and let I= 'ef;(1'). H in H -Y, and that of T in G-y. It follows that 'lj; extends to an isomorphism of H-y' with G-Y which is an inner twisting over F. In particular, we can identify Z(H-y') with Z(G-y) and, if Fis local, we can choose compatible measures on H-y' and G-y.

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