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arXiv 1302.7213math.SG
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U(n),SO(2n)和SO(2n+1)非正则余伴随轨道的Gromov宽度

Gromov width of non-regular coadjoint orbits of U(n), SO(2n) and SO(2n+1)

Milena Pabiniak

摘要:

设G是紧连通李群G,T是G的极大环面. Lie(T)^* 中通过lambda的余伴随轨道O_lambda是正则的辛流形。因此,我们可以问它的Gromov宽度的问题。在许多已知的情况下,Gromov宽度恰好是集合{< alpha_j^{ \vee },lambda > ; alpha_j^{ \vee } a coroot和< alpha_j^{ \vee },lambda > positive}上的最小值。我们证明了酉群的余伴随轨道的Gromov宽度和特殊正交群的大多数余伴随轨道的Gromov宽度至少是上述最小值。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_lambda through lambda in Lie(T)^* is canonically a symplectic manifold. Therefore we can ask the question about its Gromov width. In many known cases the Gromov width is exactly the minimum over the set {< alpha_j^{\vee},lambda > ; alpha_j^{\vee} a coroot and < alpha_j^{\vee},lambda > positive}. We show that the Gromov width of coadjoint orbits of the unitary group and of most of the coadjoint orbits of the special orthogonal group is at least the above minimum. The proof uses the torus action coming from the Gelfand-Tsetlin system.

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