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arXiv 0906.4844gr-qc
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由Laser -干涉引力波探测器中的声学和湍流现象产生的大气牛顿噪声的解析估计

Analytical Estimate of Atmospheric Newtonian Noise Generated by Acoustic and Turbulent Phenomena in Laser-Interferometric Gravitational Waves Detectors

Carlo Cafaro, S. A. Ali

摘要:

我们提出了一个理论估计的大气牛顿噪声由于大气质量密度波动产生的声学和湍流现象,我们确定这种噪声的相关性在激光干涉探测引力波。首先,我们考虑干涉仪测试质量的重力耦合大气密度的波动,由于声波的传播在一个半空间所占据的理想流体界定的无限刚性平面。我们提出了一个分析表达式的频谱的加速度波动的测试质量的干涉仪在实验上获得的频谱的压力波动。第二,我们考虑干涉仪测试质量的重力耦合到大气密度的波动,由于在湍流莱特希尔过程中产生的声波的传播。我们提出了一个分析表达式-在傅立叶空间-频谱的加速度波动的测试质量的干涉仪。最后,我们讨论了这些噪声源的相关性,在引力波的检测牛顿大气噪声的估计谱密度在这里考虑的VIRGO探测器的预期灵敏度曲线进行比较。

英文摘要:

We present a theoretical estimate of the atmospheric Newtonian noise due to fluctuations of atmospheric mass densities generated by acoustic and turbulent phenomena and we determine the relevance of such noise in the laser-interferometric detection of gravitational waves. First, we consider the gravitational coupling of interferometer test-masses to fluctuations of atmospheric density due to the propagation of sound waves in a semispace occupied by an ideal fluid delimited by an infinitely rigid plane. We present an analytical expression of the spectrum of acceleration fluctuations of the test-masses of the interferometer in terms of the experimentally obtainable spectrum of pressure fluctuations. Second, we consider the gravitational coupling of interferometer test-masses to fluctuations of atmospheric density due to the propagation of sound waves generated in a turbulent Lighthill process. We present an analytical expression - in the Fourier space - of the spectrum of acceleration fluctuations of the test-masses of the interferometer. Finally, we discuss the relevance of these noise sources in the detection of gravitational waves by comparing the estimated spectral densities of Newtonian atmospheric noises considered here to the expected sensitivity curve of the VIRGO detector.

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