AI 中文总结
本文探究非零温度对一维硬核玻色气体流体动力学化的影响，发现升温会缩短流体动力学化振荡阻尼时间与预热化时间，引入非零温度退相位时间，为该领域研究提供了新的理论结果。
AI 中文摘要
流体动力学化指相对论重离子碰撞中流体动力学描述变得适用的极快过程。在超冷一维（1D）玻色气体中观察到类似行为后，流体动力学化被推测为量子系统在高能猝灭后的普适动力学现象。目前冷原子环境下的理论研究仅限于从基态开始的猝灭。本文研究非零温度对流体动力学化的影响，具体采用均匀硬核玻色子一维气体，探究布拉格脉冲猝灭后初始温度对流体动力学化和预热化相关时间尺度的影响。研究发现，流体动力学化相干时间保持不变，而温度升高会缩短流体动力学化振荡的阻尼时间和预热化时间，这主要源于初始快度分布的展宽，还引入了基于快度分布范围定义的非零温度退相位时间。
英文摘要
Hydrodynamization refers to the remarkably rapid process in relativistic heavy-ion collisions by which hydrodynamic descriptions become applicable. Following the observation of analogous behavior in ultracold one-dimensional (1D) Bose gases, hydrodynamization has been conjectured to be a universal dynamical phenomenon in quantum systems following high-energy quenches. Theoretical studies in this cold-atom setting have so far been restricted to quenches from ground states. Here we study how nonzero temperatures affect hydrodynamization. Specifically, using a homogeneous 1D gas of hard-core bosons, we explore how the initial temperature affects the timescales associated with hydrodynamization and prethermalization following a Bragg-pulse quench. We find that while the hydrodynamization coherence time remains unchanged, increasing temperature shortens both the damping time of the hydrodynamization oscillations and the prethermalization time. We argue that this is mainly the result of the broadening of the initial rapidity distribution, and introduce a nonzero-temperature dephasing time defined in terms of the extent of the rapidity distribution.
Comments11 pages, 8 figures
