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arXiv 1404.7482gr-qcphysics.flu-dyn
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探讨浅水波模拟霍金辐射的热特性？

Probing the thermal character of analogue Hawking radiation for shallow water waves?

Florent Michel, Renaud Parentani

备注：
23 pages, 14 figures, 2 figures updated to match the PRD version, final version published in Physical Review D
发表信息：
Phys. Rev. D 90, 044033 (2014)
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摘要：

本文研究并数值计算了浅水波在定常逆流阻挡下的散射系数。当流动是跨临界的，系数密切遵循霍金的预测，根据该预测，黑洞应该发射热谱。我们研究了如何从热量的频谱偏离时，减少最大流速，特别注意亚临界流，因为这些最近已被用来测试霍金的预测。对于这样的流量，我们表明，发射光谱强烈抑制，它的普朗克字符是完全丢失。对于低频率，我们还表明，散射系数主要由弹性流体动力学通道。我们的数值结果很好地再现了S. Weinfurtner { \it等}温哥华实验然而，我们提出了一个新的解释已经观察到的，以及新的实验测试。

英文摘要：

We study and numerically compute the scattering coefficients of shallow water waves blocked by a stationary counterflow. When the flow is transcritical, the coefficients closely follow Hawking's prediction according to which black holes should emit a thermal spectrum. We study how the spectrum deviates from thermality when reducing the maximal flow velocity, with a particular attention to subcritical flows since these have been recently used to test Hawking's prediction. For such flows, we show that the emission spectrum is strongly suppressed, and that its Planckian character is completely lost. For low frequencies, we also show that the scattering coefficients are dominated by elastic hydrodynamical channels. Our numerical results reproduce rather well the observations made by S. Weinfurtner {\it et al.} in the Vancouver experiment. Nevertheless, we propose a new interpretation of what has been observed, as well as new experimental tests.

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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