Minimal representations: spherical vectors and automorphic functionals

Details Minimal representations: spherical vectors and automorphic functionals Minimal representations: spherical vectors and automorphic functionals

2002-09-24

arxiv.org/abs/math/0209315v1

Mathematics

Representation Theory

AMSLatex, 53 pages

Scientific paper

In the first part of this paper we study minimal representations of simply connected simple split groups of type $D_k$ or $E_k$ over local non-archimedian fields. Our main result is an explicit formula for the spherical vectors in these representations. In the case of real and complex groups such a formula was obtained recently in hep-th/0107222. We also use our techniques to study the structure of the space of smooth vectors in the minimal representation recovering some results of Magaard and Savin. In the second part we consider groups as above defined over a global field. In this situation we describe the form of the automorphic functional on the minimal representation of the corresponding adelic group.

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