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arXiv 0811.4554math.DG
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Courant代数胚与Poisson几何

Courant algebroids and Poisson Geometry

David Li-Bland, Eckhard Meinrenken

摘要:

给定一个流形M,其作用为二次李代数d,使得所有稳定子代数在d中余迷向,我们证明了乘积M \times d成为M上的Courant代数体.如果d上的双线性型是可裂的,则d的横拉格朗日子空间g_1,g_2的选择定义了M上的一个双向量场,如果(d,g_1,g_2)是Manin三元组,则它是Poisson的。通过这种方式,我们恢复了Lu-Yakimov的泊松结构,特别是Evens Lu泊松结构的各种拉格朗日格拉斯曼和de Concini Procesi紧化。这些例子之间的各种泊松映射解释的行为下柯朗态射的拉格朗日分裂。

英文摘要:

Given a manifold M with an action of a quadratic Lie algebra d, such that all stabilizer algebras are co-isotropic in d, we show that the product M\times d becomes a Courant algebroid over M. If the bilinear form on d is split, the choice of transverse Lagrangian subspaces g_1, g_2 of d defines a bivector field on M, which is Poisson if (d,g_1,g_2) is a Manin triple. In this way, we recover the Poisson structures of Lu-Yakimov, and in particular the Evens-Lu Poisson structures on the variety of Lagrangian Grassmannians and on the de Concini-Procesi compactifications. Various Poisson maps between such examples are interpreted in terms of the behaviour of Lagrangian splittings under Courant morphisms.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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