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arXiv 1502.04679gr-qccond-mat.quant-gasnlin.PS
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含时跨音速流中的非线性效应:模拟黑洞稳定性的分析

Non-linear effects in time-dependent transonic flows: An analysis of analogue black hole stability

Florent Michel, Renaud Parentani

摘要:

我们研究一维Gross-Pitaevskii方程的解,以更好地理解流动原子凝聚体中发生的动力学不稳定性。跨音速定常流可以用简单的术语来描述,而与时间有关的流则表现出各种各样的特性。当声速被穿越一次时,我们观察到类似于黑洞的流动遵循类似于所谓的无毛定理的东西,因为它们的后期时间轮廓是稳定的,并且由进入哈密顿量和守恒量的参数唯一固定。对于类似于白洞的流动,在晚些时候,人们发现一个宏观波动在超音速侧,它具有固定的振幅,或一个广泛变化的信号准周期发射的孤子在亚音速侧。当考虑超过声速两次的流动时,我们观察到可以从上述行为以及表征这种流动的动力学不稳定性的增长率的层次结构中理解的各种场景。

英文摘要:

We study solutions of the one-dimensional Gross-Pitaevskii equation to better understand dynamical instabilities occurring in flowing atomic condensates. Whereas transonic stationary flows can be fully described in simple terms, time-dependent flows exhibit a wide variety of behaviors. When the sound speed is crossed once, we observe that flows analogous to black holes obey something similar to the so-called no hair theorem since their late time profile is stationary and uniquely fixed by parameters entering the Hamiltonian and conserved quantities. For flows analogous to white holes, at late time one finds a macroscopic undulation in the supersonic side which has either a fixed amplitude, or a widely varying one signaling a quasi periodic emission of solitons on the subsonic side. When considering flows which cross the sound speed twice, we observe various scenarios which can be understood from the above behaviors, and from the hierarchy of the growth rates of the dynamical instabilities characterizing such flows.

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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