Extending Johnson's and Morita's homomorphisms to the mapping class group
Extending Johnson's and Morita's homomorphisms to the mapping class group
复制标题
将 Johnson 和 Morita 的同态扩展到映射类群
DOI:
10.2140/agt.2007.7.1297
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发表时间:
2007
影响因子:
0.7
通讯作者:
M. Day
中科院分区:
文献类型:
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作者:
M. Day
We extend certain homomorphisms defined on the higher Torelli subgroups of the mapping class group to crossed homomorphisms defined on the entire mapping class group. In particular, for every k 2, we construct a crossed homomorphism k which extends Morita’s homomorphismz k to the entire mapping class group. From this crossed homomorphism we also obtain a crossed homomorphism extending the k th Johnson homomorphism k to the mapping class group. D Johnson and S Morita obtained their respective homomorphisms by considering the action of the mapping class group on the nilpotent truncations of the surface group; our approach is to mimic Morita’s construction topologically by using nilmanifolds associated to these truncations. This allows us to take the ranges of these crossed homomorphisms to be certain finite-dimensional real vector spaces associated to these nilmanifolds. 57N05; 57T15
DOI:
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发表时间:
2009
期刊:
J.Algebra 321, no.11
影响因子:
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作者:
Hain;Richard;Matsumoto;Makoto
通讯作者:
Makoto
DOI:
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发表时间:
2006
期刊:
影响因子:
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作者:
Ayumi;Ohnuma;Nariya KAWAZUMI
通讯作者:
Nariya KAWAZUMI
DOI:
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发表时间:
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影响因子:
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