Abstract
Abstract
The Torelli group of
$W_g = \#^g S^n \times S^n$
is the group of diffeomorphisms of
$W_g$
fixing a disc that act trivially on
$H_n(W_g;\mathbb{Z} )$
. The rational cohomology groups of the Torelli group are representations of an arithmetic subgroup of
$\text{Sp}_{2g}(\mathbb{Z} )$
or
$\text{O}_{g,g}(\mathbb{Z} )$
. In this article we prove that for
$2n \geq 6$
and
$g \geq 2$
, they are in fact algebraic representations. Combined with previous work, this determines the rational cohomology of the Torelli group in a stable range. We further prove that the classifying space of the Torelli group is nilpotent.
Publisher
Cambridge University Press (CUP)
Subject
Computational Mathematics,Discrete Mathematics and Combinatorics,Geometry and Topology,Mathematical Physics,Statistics and Probability,Algebra and Number Theory,Theoretical Computer Science,Analysis
Cited by
11 articles.
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