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A twisted topological trace formula for Hecke operators and liftings from symplectic to general linear groups

Published online by Cambridge University Press:  09 November 2011

Uwe Weselmann*
Affiliation:
Mathematisches Institut, Im Neuenheimer Feld 288, D-69121 Heidelberg, Germany (email: weselman@mathi.uni-heidelberg.de)
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Abstract

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For the locally symmetric space X attached to an arithmetic subgroup of an algebraic group G of ℚ-rank r, we construct a compact manifold by gluing together 2r copies of the Borel–Serre compactification of X. We apply the classical Lefschetz fixed point formula to and get formulas for the traces of Hecke operators ℋ acting on the cohomology of X. We allow twistings of ℋ by outer automorphisms η of G. We stabilize this topological trace formula and compare it with the corresponding formula for an endoscopic group of the pair (G,η) . As an application, we deduce a weak lifting theorem for the lifting of automorphic representations from Siegel modular groups to general linear groups.

Type
Research Article
Copyright
Copyright © Foundation Compositio Mathematica 2011

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