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arXiv math-ph/0507062math-phhep-thmath.MPmath.QAnlin.SI
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由动力学r-矩阵和测地线运动得到的自旋Calogero模型

Spin Calogero models obtained from dynamical r-matrices and geodesic motion

L. Feher, B. G. Pusztai

摘要:

研究了自对偶李代数${\cal G}$的自同构对应的Alekseev-Meinrenken动力学r-矩阵的经典可积系统。我们证明,这些r-矩阵的唯一特征在于由一个非简并属性,并适用于建设由于李和徐相关联的自旋Calogero型模型与他们。任何这类模型的运动方程都是自然测地线方程在李群$G$上的投影,李群具有李代数${\cal G}$,它的相空间被解释为余切丛$T^*G$的开子流形的哈密顿约化,利用由$G$的伴随作用产生的对称性,由潜在的自同构扭曲。这表明了所得系统的可积性,并给出了一个算法来解决它们。作为说明性的例子,我们提出了新的模型建立在对合图自同构的真正的分裂和紧凑的简单李代数,也解释了许多进一步的例子适合在动态的r-矩阵框架。

英文摘要:

We study classical integrable systems based on the Alekseev-Meinrenken dynamical r-matrices corresponding to automorphisms of self-dual Lie algebras, ${\cal G}$. We prove that these r-matrices are uniquely characterized by a non-degeneracy property and apply a construction due to Li and Xu to associate spin Calogero type models with them. The equation of motion of any model of this type is found to be a projection of the natural geodesic equation on a Lie group $G$ with Lie algebra ${\cal G}$, and its phase space is interpreted as a Hamiltonian reduction of an open submanifold of the cotangent bundle $T^*G$, using the symmetry arising from the adjoint action of $G$ twisted by the underlying automorphism. This shows the integrability of the resulting systems and gives an algorithm to solve them. As illustrative examples we present new models built on the involutive diagram automorphisms of the real split and compact simple Lie algebras, and also explain that many further examples fit in the dynamical r-matrix framework.

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