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arXiv 1110.0803hep-thcond-mat.stat-mechmath-phmath.MPnlin.SI
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临界模型中关联函数渐近行为的形状因子方法

Form factor approach to the asymptotic behavior of correlation functions in critical models

N. Kitanine, K. K. Kozlowski, J. M. Maillet, N. A. Slavnov, V. Terras

摘要:

提出了一种计算量子临界(可积)模型中关联函数大距离渐近行为的形状因子方法。在大距离区域,我们将所有激发态的总和减少到热力学极限下费米面上粒子/空穴激发的总和。我们在所谓的临界形状因子上精确地计算这些和。这样我们就得到了关联函数渐近展开式的每个振荡谐波的超前大距离行为,包括相应的振幅。我们的方法适用于各种各样的可积模型,并产生精确的结果源于Luttinger液体的方法,共形场论预测和我们以前的分析的关联函数从他们的多重积分表示。我们认为,我们的计划适用于一般类的不可积量子临界模型以及。

英文摘要:

We propose a form factor approach for the computation of the large distance asymptotic behavior of correlation functions in quantum critical (integrable) models. In the large distance regime we reduce the summation over all excited states to one over the particle/hole excitations lying on the Fermi surface in the thermodynamic limit. We compute these sums, over the so-called critical form factors, exactly. Thus we obtain the leading large distance behavior of each oscillating harmonic of the correlation function asymptotic expansion, including the corresponding amplitudes. Our method is applicable to a wide variety of integrable models and yields precisely the results stemming from the Luttinger liquid approach, the conformal field theory predictions and our previous analysis of the correlation functions from their multiple integral representations. We argue that our scheme applies to a general class of non-integrable quantum critical models as well.

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