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arXiv 1808.06975math.SGmath.RT
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Poisson齐性空间上辛体积的集中

Concentration of symplectic volumes on Poisson homogeneous spaces

Anton Alekseev, Benjamin Hoffman, Jeremy Lane, Yanpeng Li

摘要:

对于紧Poisson-李群$K$,齐次空间$K/T$带有一族辛形式$ω_ξ^s$,其中$ξ\in \mathfrak{t}^*_+$在正Weyl腔中,$s \in \mathbb{R}$ .在对应于$ξ$的$K$余伴轨道上,将$ω_ξ^0$的辛形式与自然的$K$不变辛形式等同起来.对于固定的$ξ$值,$ω_ξ^s$的上同调类与$s$无关。本文证明了作为$s\to -\infty$,$ω_ξ^s$的辛体积集中在$K/T \cong G/B$中最小Schubert胞腔的任意小邻域内.这加强了早期的结果[9,10],并且是在$Lie(K)^*$ [4,猜想1.1]上构造全局作用角坐标的一个步骤。

英文摘要:

For a compact Poisson-Lie group $K$, the homogeneous space $K/T$ carries a family of symplectic forms $ω_ξ^s$, where $ξ\in \mathfrak{t}^*_+$ is in the positive Weyl chamber and $s \in \mathbb{R}$. The symplectic form $ω_ξ^0$ is identified with the natural $K$-invariant symplectic form on the $K$ coadjoint orbit corresponding to $ξ$. The cohomology class of $ω_ξ^s$ is independent of $s$ for a fixed value of $ξ$. In this paper, we show that as $s\to -\infty$, the symplectic volume of $ω_ξ^s$ concentrates in arbitrarily small neighbourhoods of the smallest Schubert cell in $K/T \cong G/B$. This strengthens earlier results [9,10] and is a step towards a conjectured construction of global action-angle coordinates on $Lie(K)^*$ [4, Conjecture 1.1].

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