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arXiv 1201.0240math.SG
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SO(n)余伴轨道上Gromov宽度的下界

Lower bounds for Gromov width in the SO(n) coadjoint orbits

Milena Pabiniak

摘要:

设G是紧连通李群G,T是G的极大环面. T的李代数的对偶中通过λ的余伴随轨道O_λ是一个标准的辛流形。因此,我们可以问它的Gromov宽度的问题。在许多已知的情况下,宽度恰好是λ与冠根配对的正结果的最小值:min{< α_j^{ \vee },λ> ; α_j^{ \vee }是冠根且< α_j^{ \vee },λ>是正的}。我们将证明特殊正交群的正则余伴轨道的Gromov宽度至少是这个最小值。证明使用来自Gelfand-Tsetlin系统的环面作用。

英文摘要:

Let G be a compact connected Lie group G and T its maximal torus. The coadjoint orbit O_λ through λin the dual of the Lie algebra of T, is canonically a symplectic manifold. Therefore we can ask the question of its Gromov width. In many known cases the width is exactly the minimum over the positive results of pairing λwith coroots: min{< α_j^{\vee},λ> ; α_j^{\vee} is a coroot and < α_j^{\vee},λ> is positive}. We will show that the Gromov width for regular coadjoint orbits of the special orthogonal group is at least this minimum. The proof uses the torus action coming from the Gelfand-Tsetlin system.

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