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arXiv 0705.0060math.DGmath.AG
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双实扭量空间:任意签名情形

Double solid twistor spaces: the case of arbitrary signature

Nobuhiro Honda

摘要:

在最近的一篇论文(math.DG/0701278)中,我们构造了一系列新的Moishezon扭量空间,它是著名的LeBrun扭量空间的一种变体。本文明确地给出了nCP ^2上另一系列Moishezon扭量空间的投影模型,它可以看作是Kreussler,Kurke,Poon和作者在3CP ^2上研究的“双立体型”扭量空间的推广。类似于3CP^2上的“双立体型”扭量空间,当前扭量空间的投射模型具有CP^1上CP^2-丛的双覆盖的自然结构。明确地给出了对纤维限制为四次的二重覆盖的分支因子的定义多项式。如果n>3,这些是新的扭量空间,尽作者所知。我们还计算了这些扭量空间的模空间的维数。本文的研究是基于对扭量空间的多(半)反正则系统的分析。

英文摘要:

In a recent paper (math.DG/0701278) we constructed a series of new Moishezon twistor spaces which is a kind of variant of the famous LeBrun twistor spaces. In this paper we explicitly give projective models of another series of Moishezon twistor spaces on nCP^2 for arbitrary n>2, which can be regarded as a generalization of the twistor spaces of a 'double solid type' on 3CP^2 studied by Kreussler, Kurke, Poon and the author. Similarly to the twistor spaces of 'double solid type' on 3CP^2, projective models of present twistor spaces have a natural structure of double covering of a CP^2-bundle over CP^1. We explicitly give a defining polynomial of the branch divisor of the double covering whose restriction to fibers are degree four. If n>3 these are new twistor spaces, to the best of the author's knowledge. We also compute the dimension of the moduli space of these twistor spaces. Differently from math.DG/0701278, the present investigation is based on analysis of pluri-(half-)anticanonical systems of the twistor spaces.

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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