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arXiv math-ph/0205045math-phhep-thmath.DSmath.MPnlin.SI
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有限长XX -自旋链中的渐近性与泛函形式

Asymptotics and functional form of correlators in the XX - spin chain of finite length

A. A. Ovchinnikov

摘要:

我们验证了XX链的自旋-自旋等时关联函数的渐近性的函数形式,该函数形式由大距离共形不变性假设和玻色化过程预测。我们指出玻色化也预言了有限长链的关联函数的函数形式。我们得到了有限格点上自旋-自旋等时相关器的精确表达式.我们找到了很好的协议的精确相关的预测给出的领先的渐近结果非常小的距离。我们还建立了XX链的渐近前常数的值与Lukyanov和Zamolodchikov提出的常数的表达式之间的对应关系。我们还评估了常数对应的次领先项的渐近的方式,这是不同于以往的研究。

英文摘要:

We verify the functional form of the asymptotics of the spin - spin equal - time correlation function for the XX-chain, predicted by the hypothesis of conformal invariance at large distances and by the bosonization procedure. We point out that bosonization also predicts the functional form of the correlators for the chains of finite length. We found the exact expression for the spin- spin equal- time correlator on finite lattice. We find the excellent agreement of the exact correlator with the prediction given by the leading asymptotics result up to the very small distances. We also establish the correspondence between the value of the constant before the asymptotics for the XX- chain with the expression for this constant proposed by Lukyanov and Zamolodchikov. We also evaluate the constant corresponding to the subleading term in the asymptotics in a way which is different from the previous studies.

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