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arXiv math-ph/0408043math-phmath.MP
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一维广义局域相互作用:描述可区分粒子的量子多体系统的解

Generalized local interactions in 1D: solutions of quantum many-body systems describing distinguishable particles

Martin Hallnäs, Edwin Langmann, Cornelius Paufler

摘要:

众所周知,在一维空间中存在一个四参数的局部相互作用族。我们解释这些参数作为耦合常数的δ型相互作用,其中包括不同种类的动量依赖项,我们确定所有的情况下,导致可区分的粒子的多体系统是精确可解的坐标Bethe Angloman。我们发现两个这样的家庭的系统,一个有两个独立的耦合常数变形的著名的三角洲相互作用模型,以不同的粒子,和其他特定的一个参数组合的三角洲和(所谓的)三角洲总理的相互作用。我们还发现,非全同粒子的模型产生了一个有点不寻常的解决方案的杨巴克斯特关系。对于另一个模型,我们写出所有本征函数的显式公式。

英文摘要:

As is well-known, there exists a four parameter family of local interactions in 1D. We interpret these parameters as coupling constants of delta-type interactions which include different kinds of momentum dependent terms, and we determine all cases leading to many-body systems of distinguishable particles which are exactly solvable by the coordinate Bethe Ansatz. We find two such families of systems, one with two independent coupling constants deforming the well-known delta interaction model to non-identical particles, and the other with a particular one-parameter combination of the delta- and (so-called) delta-prime interaction. We also find that the model of non-identical particles gives rise to a somewhat unusual solution of the Yang-Baxter relations. For the other model we write down explicit formulas for all eigenfunctions.

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