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arXiv 1101.0844math-phcond-mat.stat-mechhep-thmath.MPnlin.SI
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非线性薛定谔模型中电流-电流关联函数的长时间大距离渐近行为

Long-time and large-distance asymptotic behavior of the current-current correlators in the non-linear Schrödinger model

K. K. Kozlowski, V. Terras

摘要:

我们提出了一种新的方法,使我们能够从量子可积模型的精确表示导出其关联函数的长时间和大距离渐近行为。本文从有限体积中关联函数的形状因子展开出发,说明了如何将相互作用可积模型中的计算复杂度降低到自由费米子等效模型中的计算复杂度。我们将我们的方法应用于非线性薛定谔模型中的含时零温电流-电流关联函数,并计算其渐近展开式中的前几项。我们的结果超越了基于共形场论的预测:在依赖于时间的情况下,其他类型的激发比费米表面上的渐近的领先的订单作出贡献。

英文摘要:

We present a new method allowing us to derive the long-time and large-distance asymptotic behavior of the correlations functions of quantum integrable models from their exact representations. Starting from the form factor expansion of the correlation functions in finite volume, we explain how to reduce the complexity of the computation in the so-called interacting integrable models to the one appearing in free fermion equivalent models. We apply our method to the time-dependent zero-temperature current-current correlation function in the non-linear Schrödinger model and compute the first few terms in its asymptotic expansion. Our result goes beyond the conformal field theory based predictions: in the time-dependent case, other types of excitations than the ones on the Fermi surface contribute to the leading orders of the asymptotics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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