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Annihilators and Associated Varieties of A$ q $(λ) Modules for U(p, q)

Published online by Cambridge University Press:  04 December 2007

Peter E. Trapa
Affiliation:
School of Mathematics, Institute for Advanced Study, Princeton, NJ 08540, U.S.A. E-mail: [email protected]
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Abstract

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Vogan has conjectured that the cohomologically induced modules A$_ q$(λ) in the weakly fair range exhaust all unitary representations of U(p, q) with certain kinds of real integral infinitesimal character. To prove a statement like this, it is essential to identify these modules among the set of all irreducible Harish-Chandra modules. Barbasch and Vogan have parametrized this latter set in terms of their annihilators and asymptotic supports (or, equivalently, associated varieties). In this paper, we identify the weakly fair A$_ q$(λ) in this parametrization by combining known results about their asymptotic supports together with an explicit computation of their annihilators. In particular, this determines all vanishing and coincidences among the A$_ q$(λ) in the weakly fair range, and gives the Langlands parameters of these modules.

Type
Research Article
Copyright
© 2001 Kluwer Academic Publishers