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arXiv 0905.2656math.DG
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复切触流形的切触线丛的浸入性及其在自同构群中的应用

Immersivity of the contact line bundle of a complex-contact manifold and an application to the automorphism group

Osami Yasukura

AI总结:

本文研究复切触流形切触线丛的浸入性,将既有极丰沛、一般有限加约化自同构群的条件放宽为浸入性,证明具浸入切触线丛的连通紧复切触流形自同构群同构于对应秩>1单复李代数的自同构群,并给出其不连通的型的条件。

摘要:

若切触线丛是极丰沛的,则连通Fano复切触流形同构于Boothby型的凯勒C-空间,该空间具有对应于非交换单复李代数的自然复切触结构。A. Beauville将该条件放宽为两个假设:切触线丛是一般有限的,且自同构群是约化的。我们将该条件放宽为另一个条件:切触线丛是浸入的,即该流形可全纯浸入到与该线丛的某些全纯截面相关的某个射影空间中。作为应用,我们得到:具有浸入切触线丛的连通紧复切触流形的自同构群,同构于秩大于1的相应单复李代数的自同构群;该自同构群不连通当且仅当它的型为n>1时的Aₙ、Dₙ₊₂或E₆。

英文摘要:

A connected Fano complex-contact manifold is isomorphic to the kaehlerian C-space of Boothby type with a natural complex-contact structure corresponding to a non-abelian simple complex Lie algebra if the contact line bundle is very ample. A. Beauville relaxed the provision to two assumptions that the contact line bundle is generically finite and that the automorphism group is reductive. We relax the provision to another one that that the contact line bundle is immersive, that is, the manifold admits a holomorphic immersion into some projective space associated with some holomorphic sections of the line bundle. As an application, we obtain that the automorphism group of a connected compact complex-contact manifold with immersive contact line bundle is isomorphic to the automorphism group of the corresponding simple complex Lie algebra of rank greater than one, which is not connected if and only if its type is A_{n}, D_{n+2} for n > 1 or E_{6}.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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