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arXiv math-ph/0609085math-phhep-thmath.MPnlin.SI
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单李群上自由运动的一类Calogero型约化

A class of Calogero type reductions of free motion on a simple Lie group

L. Feher, B. G. Pusztai

摘要:

研究了非紧单李群G上自由测地线运动基于极大紧子群$G_+ \subset G$的左乘和右乘所给出的$G_+ \times G_+$对称性的约化.在通用值的动量地图,这导致(新的)自旋Calogero型模型。在某些特殊值下,自旋自由度不存在,我们得到了标准的$BC_n$ Sutherland模型,它具有三个独立的耦合常数,分别来自SU(n+1,n)和SU(n,n).从G=SU(n+1,n)的$G/G_+$上的测地线得到的具有两个独立耦合常数的$BC_n$模型的Olshanetsky-Perelomov推导的推广依赖于将右手动量固定为$G_+$的非零特征。考虑的减少允许进一步的推广和工作在量子化的水平,也为非紧的,以及为紧G。

英文摘要:

The reductions of the free geodesic motion on a non-compact simple Lie group G based on the $G_+ \times G_+$ symmetry given by left- and right multiplications for a maximal compact subgroup $G_+ \subset G$ are investigated. At generic values of the momentum map this leads to (new) spin Calogero type models. At some special values the `spin' degrees of freedom are absent and we obtain the standard $BC_n$ Sutherland model with three independent coupling constants from SU(n+1,n) and from SU(n,n). This generalization of the Olshanetsky-Perelomov derivation of the $BC_n$ model with two independent coupling constants from the geodesics on $G/G_+$ with G=SU(n+1,n) relies on fixing the right-handed momentum to a non-zero character of $G_+$. The reductions considered permit further generalizations and work at the quantized level, too, for non-compact as well as for compact G.

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