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arXiv 1507.06151math.CV
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切向Cauchy-Riemann方程解的新延拓现象

New extension phenomena for solutions of tangential Cauchy\,-\,Riemann Equations

Ilya Kossovskiy, Bernhard Lamel

摘要:

在我们最近的工作[25]中,我们证明了$\mathbb C^{2}$中实解析Levi-非平坦超曲面的$C^\infty$ CR-同态一般不是解析的。这个结果再次提出了关于实解析超曲面的CR-映射的性质的问题。在本文中,我们给出了CR映射实际上是什么的完整图片。首先,我们发现了CR-同态的一个解析延拓现象,我们称之为{ \em扇形解析性质}。它似乎是一般CR-同态的最优正则性。我们强调,这种类型的扩展以前从未出现在文献中。其次,我们引入了{ \em Fuchsian型超曲面}类,证明了Fuchsian型超曲面的CR-自同构(的无穷小生成元)仍然是解析的。特别地,这解决了[28]中公式化的问题。最后,我们证明了Fuchsian型超曲面的{ \em formal} CR-自同构的一个正则性结果.

英文摘要:

In our recent work [25] we showed that $C^\infty$ CR-diffeomorphisms of real-analytic Levi-nonflat hypersurfaces in $\mathbb C^{2}$ are not analytic in general. This result raised again the question on the nature of CR-maps of real-analytic hypersurfaces. In this paper, we give a complete picture of what CR-maps actually are. First, we discover an analytic continuation phenomenon for CR-diffeomorphisms which we call the {\em sectorial analyticity property}. It appears to be the optimal regularity property for CR-diffeomorphisms in general. We emphasize that such type of extension never appeared previously in the literature. Second, we introduce the class of {\em Fuchsian type hypersurfaces} and prove that (infinitesimal generators of) CR-automorphisms of a Fuchsian type hypersurface are still analytic. In particular, this solves a problem formulated in [28]. Finally, we prove a regularity result for {\em formal} CR-automorphisms of Fuchsian type hypersurfaces.

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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