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arXiv 2102.08599math.CVmath.DG
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具有一维Levi核的齐次2-非退化超曲面型CR结构对称群的最大维数

Maximal dimension of groups of symmetries of homogeneous 2-nondegenerate CR structures of hypersurface type with a 1-dimensional Levi kernel

David Sykes, Igor Zelenko

摘要:

我们证明了对于每一个$n\geq 3$,具有$1$维Levi核的齐次、2-非退化、$(2n+1)$维超曲面型CR流形的对称群的维数的精确上界等于$n^2+7$,同时对于一类更一般的结构建立了相同的结果,其特征在于弱化了齐次条件.这支持了Beloshapka的猜想,即对于给定维度的底层流形,具有最大有限维对称群的超曲面模型是Levi非退化的。

英文摘要:

We prove that for every $n\geq 3$ the sharp upper bound for the dimension of the symmetry groups of homogeneous, 2-nondegenerate, $(2n+1)$-dimensional CR manifolds of hypersurface type with a $1$-dimensional Levi kernel is equal to $n^2+7$, and simultaneously establish the same result for a more general class of structures characterized by weakening the homogeneity condition. This supports Beloshapka's conjecture stating that hypersurface models with a maximal finite dimensional group of symmetries for a given dimension of the underlying manifold are Levi nondegenerate.

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