Mathematics – Representation Theory
Scientific paper
2005-08-29
Mathematics
Representation Theory
11 pages, Notes of a course given at the Summer School "Algebraic Groups" in Goettingen, June 27 - July 15
Scientific paper
The goal of the course was a review of results mainly due to M. Olbrich and the first author. We consider a discrete cocompact subgroup $\Gamma$ of a semisimple Lie group $G$. We relate the group cohomology of $\Gamma$ with coefficients in the maximal globalization of a representation of $G$ with the multiplicities of unitary representations of $G$ in $L^2(G/\Gamma)$. Explicit calculations are given in the case $G=SL(2,R)$. In the rank-one case we state a version of the Selberg trace formula, discuss the singularities of the Selberg zeta-functions, and state their relation with the cohomology of $\Gamma$ in principal series representations.
Bunke Ulrich
Waldmueller Robert
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