Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2009-06-26
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
v2: few changes, one table and references added, 17 pages, no figures; accepted for publication (special issue) in the Open As
Scientific paper
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.
Ali Syed Amjad
Cafaro Carlo
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