Maximal tori in the contactomorphism groups of circle bundles over Hirzebruch surfaces

Maximal tori in the contactomorphism groups of circle bundles over Hirzebruch surfaces
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Hirzebruch 表面上圆束接触同像群中的最大环面

DOI:
10.4310/mrl.2003.v10.n1.a13
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发表时间:
2002
影响因子:
1
通讯作者:
E. Lerman
E. Lerman
中科院分区:
数学3区
文献类型:
--
作者:
E. Lerman

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在最近的预印本中,Yael Karshon 表明,Hirzebruch 曲面的一组辛同胚中存在非共轭环面。她根据辛结构的上同调类来计算它们。我们表明,Hirzebruch 表面上的前量子圆束的接触同态群中也存在类似的现象。请注意,所讨论的接触结构是可填充的。这可能与之前的一篇论文形成鲜明对比,在该论文中,我们表明在某些过度扭曲透镜空间的接触同胚群中存在无限多个非共轭环面(接触切割,Israel J. Math,124(2001),77--92)。
In a recent preprint Yael Karshon showed that there exist non-conjugate tori in a group of symplectomorphisms of a Hirzebruch surface. She counted them in terms of the cohomology class of the symplectic structure. We show that a similar phenomenon exists in the contactomorphism groups of pre-quantum circle bundles over Hirzebruch surfaces. Note that the contact structures in question are fillable. This may be contrasted with an earlier paper where we showed that there are infinitely many non-conjugate tori in the contactomorphism groups of certain overtwisted lens spaces (Contact cuts, Israel J. Math, 124(2001), 77--92).