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>Searching for a Stochastic Background of Gravitational Waves with the Laser Interferometer Gravitational-Wave Observatory
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Searching for a Stochastic Background of Gravitational Waves with the Laser Interferometer Gravitational-Wave Observatory
The Laser Interferometer Gravitational-Wave Observatory (LIGO) has performed the fourth science run, S4, with significantly improved interferometer sensitivities with respect to previous runs. Using data acquired during this science run, we place a limit on the amplitude of a stochastic background of gravitational waves. For a frequency independent spectrum, the new Bayesian 90% upper limit is ΩGW × [H0/(72 km s?1 Mpc?1)]2 6.5 × 10-5. This is currently the most sensitive result in the frequency range 51-150 Hz, with a factor of 13 improvement over the previous LIGO result. We discuss the complementarity of the new result with other constraints on a stochastic background of gravitational waves, and we investigate implications of the new result for different models of this background.
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机译:激光干涉仪重力波天文台(LIGO)进行了第四次科学运行,即S4,与以前的运行相比,干涉仪的灵敏度大大提高。使用此科学运行期间获得的数据,我们对重力波的随机背景的振幅进行了限制。对于与频率无关的频谱,新的贝叶斯90%上限为ΩGW×[H0 /(72 km s?1 Mpc?1)] 2 <6.5×10-5。这是当前在51-150 Hz频率范围内最敏感的结果,比以前的LIGO结果提高了13倍。我们讨论了在重力波随机背景下新结果与其他约束条件的互补性,并且我们研究了新结果对这种背景下不同模型的影响。
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