A two-way approach to out-of-time-order correlators

A two-way approach to out-of-time-order correlators
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一种处理乱序相关器的双向方法

DOI:
10.1007/jhep03(2022)133
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发表时间:
2021
影响因子:
5.4
通讯作者:
Pengfei Zhang
Pengfei Zhang
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yingfei Gu;A. Kitaev;Pengfei Zhang

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无序相关器(OTOCs)是衡量量子混沌的标准尺度。在涉及的四名操作员中,一对可能被视为源,另一对可能被视为探测器。一种适用于大N系统(如SYK模型)的常用方法是用平均场摄动代替实际源,并求解双Keldysh等高线上的探测关联函数。我们展示了如何通过组合两个这样的解来获得时间向前和向后传播的微扰的OTOC。这些动力学扰动或扰动模在热场双重背景下被考虑,并被分解为相干部分和非相干部分。对于大Q系统,我们得到了闭合形式的OTOC。我们还证明了先前猜想的Lyapunov指数与谱函数的高频行为之间的关系。
Out-of-time-order correlators (OTOCs) are a standard measure of quantum chaos. Of the four operators involved, one pair may be regarded as a source and the other as a probe. A usual approach, applicable to large-N systems such as the SYK model, is to replace the actual source with some mean-field perturbation and solve for the probe correlation function on the double Keldysh contour. We show how to obtain the OTOC by combining two such solutions for perturbations propagating forward and backward in time. These dynamical perturbations, or scrambling modes, are considered on the thermofield double background and decomposed into a coherent and an incoherent part. For the large-q SYK, we obtain the OTOC in a closed form. We also prove a previously conjectured relation between the Lyapunov exponent and high-frequency behavior of the spectral function.
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影响因子: 5.4
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