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arXiv math-ph/0604036math-phcond-mat.stat-mechhep-thmath.MPnlin.SI
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Onsager代数的q-变形模拟:超越Bethe代数方法

The q-deformed analogue of the Onsager algebra: Beyond the Bethe ansatz approach

Pascal Baseilhac

摘要:

研究了由q-Onsager非Abel无穷维代数的生成元构成的算子的谱性质。使用适当的功能表示,所有的特征函数服从二阶q-差分方程(或其退化离散版本)。在与多项式本征函数(或其离散类似物)相关的代数部分中,贝特方程自然出现。在这个部分之外,Bethe anomaly方法在相关的大质量量子可积模型中不适用,本征函数也被描述。用这种方法重新考虑了具有一般可积边界条件的自旋半XXZ开自旋链:构造了所有的本征态。在对应于参数间特殊关系的代数区间,恢复了已知结果。

英文摘要:

The spectral properties of operators formed from generators of the q-Onsager non-Abelian infinite dimensional algebra are investigated. Using a suitable functional representation, all eigenfunctions are shown to obey a second-order q-difference equation (or its degenerate discrete version). In the algebraic sector associated with polynomial eigenfunctions (or their discrete analogues), Bethe equations naturally appear. Beyond this sector, where the Bethe ansatz approach is not applicable in related massive quantum integrable models, the eigenfunctions are also described. The spin-half XXZ open spin chain with general integrable boundary conditions is reconsidered in light of this approach: all the eigenstates are constructed. In the algebraic sector which corresponds to special relations among the parameters, known results are recovered.

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