Local torus actions modeled on the standard representation
Local torus actions modeled on the standard representation
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以标准表示为模型的局部环面动作
DOI:
10.1016/j.aim.2011.04.007
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发表时间:
2011
期刊:
影响因子:
--
通讯作者:
吉田尚彦
中科院分区:
文献类型:
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作者:
Akito Futaki;Yuji Sano;Hiroshi Iriyeh(第一著者);中井洋史;Yuji Sano;入江博;中井洋史;佐野友二;入江博;中井洋史;真島聖子,梅野正信;Hiroshi Iriyeh;佐野友二;中井洋史;真島 聖子;Hiroshi Iriyeh;中井洋史,加藤諒;真島聖子;Yuji Sano;入江博;Yuji Sano;中井洋史(加藤諒氏と共同);入江博;真島聖子;本間泰史;入江博;中井洋史;Yuji Sano;真島聖子;Yuji Sano;吉田尚彦;本間泰史;入江博;中井洋史;真島聖子;Yuji Sano;井上健・山本史華・中井洋史;本間泰史;Hiroshi Iriyeh;吉田尚彦
We introduce the notion of a local torus action modeled on the standard representation (for simplicity, we call it a local torus action). It is a generalization of a locally standard torus action and also an underlying structure of a locally toric Lagrangian fibration. For a local torus action, we define two invariants called a characteristic pair and an Euler class of the orbit map, and prove that local torus actions are classified topologically by them. As a corollary, we obtain a topological classification of locally standard torus actions, which includes the topological classifications of quasi-toric manifolds by Davis and Januszkiewicz and of effective T 2-actions on four-dimensional manifolds without nontrivial finite stabilizers by Orlik and Raymond. We discuss locally toric Lagrangian fibrations from the viewpoint of local torus actions. We also investigate the topology of a manifold equipped with a local torus action when the Euler class of the orbit map vanishes.