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arXiv 1108.5380cond-mat.quant-gas
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一维可积系统的热化

Thermalization in a one-dimensional integrable system

Pjotrs Grisins, Igor E. Mazets

摘要:

我们给出的数值结果表明,在一维可积系统(一个准凝聚的超冷,弱相互作用玻色子原子作为一个明确的例子正在研究)的单粒子可观的热化的可能性。这些结果可能看起来违反直觉,因为物理系统在量子和经典(平均场)描述中都是可积的。然而,我们发现一类初始条件,允许放松的分布的单粒子可观的平衡态非常接近玻色-爱因斯坦热分布的Bogoliubov准粒子。我们的数值结果使我们能够解释实验观察到的热化在一维超冷原子气体在一个短的时间尺度(~1毫秒)。

英文摘要:

We present numerical results demonstrating the possibility of thermalization of single-particle observables in a one-dimensional integrable system (a quasicondensate of ultra-cold, weakly-interacting bosonic atoms being studied as a definite example). These results may seem counterintuitive because the physical system is integrable in both the quantum and classical (mean-field) descriptions. However, we find a class of initial conditions that admits the relaxation of distributions of single-particle observables to the equilibrium state very close to the Bose-Einstein thermal distribution of Bogoliubov quasiparticles. Our numerical results allow us to explain experimentally observed thermalization in one-dimensional ultracold atomic gases on a short (~1 ms) time scale.

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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