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arXiv 0906.3079math.CV
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实解析CR-流形的局部CR-自同构的正则化

Regularization of Local CR-Automorphisms of Real-Analytic CR-Manifolds

A. Isaev., W. Kaup

摘要:

设M是有限维复向量空间E的连通一般实解析CR-子流形。设对M中的每一点a,M在a处的所有无穷小实解析CR-自同构的芽的李代数hol(M,a)是有限维的,其复化包含所有常数向量场和Euler向量场.在这些假设下,我们证明了:(1)每个hol(M,a)都由多项式向量场构成,因此与M的所有无穷小实解析CR-自同构的李代数hol(M)重合;(II)M的每个局部实解析CR-自同构扩张到E的一个双有理变换,和(III)基团Bir(M)由这样的双有理变换产生的一个双有理变换被实现为一组射影变换,当将E作为Zebranki开子集嵌入到一个射影变换中时,代数簇在进一步的假设下,证明了群Bir(M)具有至多可数个连通分支的李群的结构和李代数hol(M).所有上述结果适用于,例如,列维非退化二次曲面,以及大量的列维退化管流形。

英文摘要:

Let M be a connected generic real-analytic CR-submanifold of a finite-dimensional complex vector space E. Suppose that for every point a in M the Lie algebra hol(M,a) of germs of all infinitesimal real-analytic CR-automorphisms of M at a is finite-dimensional and its complexification contains all constant vector fields and the Euler vector field. Under these assumptions we show that: (I) every hol(M,a) consists of polynomial vector fields, hence coincides with the Lie algebra hol(M) of all infinitesimal real-analytic CR-automorphisms of M; (II) every local real-analytic CR-automorphism of M extends to a birational transformation of E, and (III) the group Bir(M) generated by such birational transformations is realized as a group of projective transformations upon embedding E as a Zariski open subset into a projective algebraic variety. Under additional assumptions the group Bir(M) is shown to have the structure of a Lie group with at most countably many connected components and Lie algebra hol(M). All of the above results apply, for instance, to Levi non-degenerate quadrics, as well as a large number of Levi degenerate tube manifolds.

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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