The cohomology of Torelli groups is algebraic
The cohomology of Torelli groups is algebraic
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Torelli 群的上同调是代数的
DOI:
10.1017/fms.2020.41
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Randal-Williams, Oscar
中科院分区:
文献类型:
--
作者:
Kupers, Alexander;Randal-Williams, Oscar
The Torelli group of is the group of diffeomorphisms of fixing a disc that act trivially on . The rational cohomology groups of the Torelli group are representations of an arithmetic subgroup of or . In this article we prove that for and , 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.
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