Searching for a stochastic background of gravitational waves with the laser interferometer gravitational-wave observatory

Abbott, B. and Cantley, C.A., LIGO Scientific Collaboration (2007) Searching for a stochastic background of gravitational waves with the laser interferometer gravitational-wave observatory. Astrophysical Journal, 659 (2 I). pp. 918-930. ISSN 0004-637X

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    Abstract

    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.