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arXiv 2207.05511math.DGmath-phmath.DSmath.MP
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Poisson-李群上Hamilton动力学的单模性和不变体积形式

Unimodularity and invariant volume forms for Hamiltonian dynamics on Poisson-Lie groups

I. Gutierrez-Sagredo, D. Iglesias Ponte, J. C. Marrero, E. Padrón, Z. Ravanpak

摘要:

本文讨论了Poisson-李群上哈密顿系统不变体积形式的存在性与Poisson-Lie结构的单模性之间的关系。特别地,我们证明了具有幺模Poisson-Lie结构的李群上的Hamilton向量场保持群上任何左不变体积的倍数。反过来,我们也证明了如果存在一个Hamilton函数,使得李群的单位元是非退化奇点,并且相应的Hamilton向量场保持体积形式,则Poisson-Lie结构必然是幺模的.此外,我们用不同的有趣的例子来说明我们的理论,无论是在半单和么模泊松-李群。

英文摘要:

In this paper, we discuss several relations between the existence of invariant volume forms for Hamiltonian systems on Poisson-Lie groups and the unimodularity of the Poisson-Lie structure. In particular, we prove that Hamiltonian vector fields on a Lie group endowed with a unimodular Poisson-Lie structure preserve a multiple of any left-invariant volume on the group. Conversely, we also prove that if there exists a Hamiltonian function such that the identity element of the Lie group is a nondegenerate singularity and the associated Hamiltonian vector field preserves a volume form, then the Poisson-Lie structure is necessarily unimodular. Furthermore, we illustrate our theory with different interesting examples, both on semisimple and unimodular Poisson-Lie groups.

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