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.
我们表明,对于双酉踢链,建立在一对复杂的阿达玛矩阵,严格的本地,无迹运营商消失完全相同的足够长的链。另一方面,运营商支持在对相邻的链网站,一般来说,表现出非平凡的相关性沿光锥边缘。与贝尔蒂尼等协议。[Phys. Rev. Lett. 123,210601(2019)],它们可以通过传递矩阵$T$的期望值来表示。此外,我们确定了一个显着的家庭的双酉模型的频谱上的$T$的明确信息是可用的。对于这类模型,我们提供了一个封闭的解析公式,相应的两点分解。这一结果,反过来,允许在双幺正制度,这是举例说明踢伊辛自旋链附近的本地recruitors的评价。
Long-distance and large-time asymptotic behaviour of dynamic correlation functions in the massless regime of the XXZ spin-1/2 chain
从最近得到的两点动力学关联函数的无质量形状因子展开式出发,导出了这些关联子的长距离和大时间渐近性。分析产生的临界指数和相关的振幅特征的渐近。这些结果是基于精确的和基于第一原理的考虑得到的:它们是\textit{do not rely, at any stage},是基于与场论或使用任何其他唯象方法的一些假设的对应关系。基于形状因子展开,该方法允许人们清楚地识别哪类激发态对渐近问题的贡献。所有这一切允许解决长期存在的问题的贡献的束缚态的两点函数的渐近性。例如,当考虑等时量子的长距离PDMATHAMN行为时,分析表明,虽然\textit{in fine},束缚态只产生在$m$中指数小的贡献,但它们在抵消某些幂律贡献方面也起着关键作用,如果它们存在的话,将明确打破长距离行为的普适性结构。