Quantum density fluctuations in classical liquids.
Quantum density fluctuations in classical liquids.
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经典液体中的量子密度涨落。
DOI：
10.1103/physrevlett.102.030602
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发表时间：
2008
影响因子：
8.6
通讯作者：
N. Svaiter
中科院分区：
文献类型：
--
作者：
L. Ford;N. Svaiter
我们假设线性色散关系，讨论由于零点运动引起的流体密度波动。我们认为，流体中的密度波动可以成为一个有用的模拟模型，可以更好地理解相对论量子场论中的波动。我们通过零点密度涨落计算光散射的微分截面，得到与光频率的五次方成正比的结果。与热密度波动引起的散射相比，我们对这种效应的相对大小进行了一些估计，并发现对于液态氖气在光频率下的影响约为 13%。该相对幅度与频率成正比，与温度成反比。虽然零点密度波动引起的散射很小，但还是可以观察到的。
We discuss the density fluctuations of a fluid due to zero point motion, assuming a linear dispersion relation. We argue that density fluctuations in a fluid can be a useful analog model for better understanding fluctuations in relativistic quantum field theory. We calculate the differential cross section for light scattering by the zero point density fluctuations, and find a result proportional to the fifth power of the light frequency. We give some estimates of the relative magnitude of this effect compared to the scattering by thermal density fluctuations, and find that it can be of the order 13% for liquid neon at optical frequencies. This relative magnitude is proportional to frequency and inversely proportional to temperature. Although the scattering by zero point density fluctuation is small, it may be observable.