Restrictions of representations of classical groups: examples

Details Restrictions of representations of classical groups: examples Restrictions of representations of classical groups: examples

2009-09-16

arxiv.org/abs/0909.2993v1

Mathematics

Number Theory

58 pages

Scientific paper

In an earlier paper, we considered several restriction problems in the representation theory of classical groups over local and global fields. Assuming the Langlands-Vogan parameterization of irreducible representations, we formulated precise conjectures for the solutions of these restriction problems. In the local case, our conjectural answer is given in terms of Langlands parameters and certain natural symplectic root numbers associated to them. In the global case, the conjectural answer is expressed in terms of the central critical value or derivative of a global $L$-function. In this paper we verify several of these conjectures in certain low rank cases, using methods of base change, theta correspondence, and global arguments.

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