The homological torsion of PSL_2 of the imaginary quadratic integers

Details The homological torsion of PSL_2 of the imaginary quadratic integers The homological torsion of PSL_2 of the imaginary quadratic integers

2011-08-23

arxiv.org/abs/1108.4608v1

Mathematics

K-Theory and Homology

Revised manuscript, accepted for publication at the Transactions of the AMS

Scientific paper

Denote by Q(sqrt{-m}), with m a square-free positive integer, an imaginary quadratic number field, and by A its ring of integers. The Bianchi groups are the groups SL_2(A). We reveal a correspondence between the homological torsion of the Bianchi groups and new geometric invariants, which are effectively computable thanks to their action on hyperbolic space. We expose a novel technique, the torsion subcomplex reduction, to obtain these invariants. We use it to explicitly compute the integral group homology of the Bianchi groups. Furthermore, this correspondence facilitates the computation of the equivariant K-homology of the Bianchi groups. By the Baum/Connes conjecture, which is verified by the Bianchi groups, we obtain the K-theory of their reduced C*-algebras in terms of isomorphic images of their equivariant K-homology.

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