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arXiv 0707.2125math.DGmath.CV
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有界对称整环的双单同态群

The bisymplectomorphism group of a bounded symmetric domain

Antonio J. Di Scala, Andrea Loi, Guy Roos

摘要:

复向量空间中的埃尔米特有界对称域,在它的圈化实现中,被赋予两种自然的辛形式:平坦形式和双曲形式。类似地,环境向量空间也被赋予两种自然辛形式:Fubini-Study形式和平坦形式。在arXiv:math.DG/0603141中已经表明,存在从域到环境向量空间的同构,其对应于上述形式对。这种现象被称为埃尔米特非紧对称空间的辛对偶。在这篇文章中,我们首先给出一个不同的和更简单的证明。然后,为了度量这种辛对偶映射的非唯一性,我们确定了有界对称整环的双辛同胚群,即同时保持双曲型和平坦辛型的双辛同胚群.这个群是线性自同构的紧李群与无限维阿贝尔群的直积。这个结果表现为一种Schwarz引理。

英文摘要:

An Hermitian bounded symmetric domain in a complex vector space, given in its circled realization, is endowed with two natural symplectic forms: the flat form and the hyperbolic form. In a similar way, the ambient vector space is also endowed with two natural symplectic forms: the Fubini-Study form and the flat form. It has been shown in arXiv:math.DG/0603141 that there exists a diffeomorphism from the domain to the ambient vector space which puts in correspondence the above pair of forms. This phenomenon is called symplectic duality for Hermitian non compact symmetric spaces. In this article, we first give a different and simpler proof of this fact. Then, in order to measure the non uniqueness of this symplectic duality map, we determine the group of bisymplectomorphisms of a bounded symmetric domain, that is, the group of diffeomorphisms which preserve simultaneously the hyperbolic and the flat symplectic form. This group is the direct product of the compact Lie group of linear automorphisms with an infinite-dimensional Abelian group. This result appears as a kind of Schwarz lemma.

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