Invariant representations of GSp(2) under tensor product with a quadratic character

Details Invariant representations of GSp(2) under tensor product with a quadratic character Invariant representations of GSp(2) under tensor product with a quadratic character

2006-12-29

arxiv.org/abs/math/0612850v1

Mathematics

Number Theory

164 pages

Scientific paper

In the first part of the book, we classify the automorphic representations of {\rm GSp}(2) which are invariant under tensor product with a given quadratic id\`ele class character, via the lifting of automorphic representations of twisted endoscopic groups. In the second part of the book, we classify the admissible representations of {\rm GSp}(2, k), k a p-adic field, which are invariant under tensor product with a given quadratic character of k^\times. This classification is given in terms of twisted character identities among the admissible representations of {\rm GSp}(2, k) and those of its twisted endoscopic groups. The main tool which we use is the trace formula technique.

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