| Source: |
The Astrophysical journal 659 (2007): 918–930. doi:10.1086/511329 ; info:cnr-pdr/source/autori:B. Abbott (1) , R. Abbott (1) , R. Adhikari (1) , J. Agresti (1) , P. Ajith (2) , B. Allen (3) , R. Amin (4) , S. B. Anderson (1) , W. G. Anderson (3) , M. Araya (1) , H. Armandula (1) , M. Ashley (5) , S Aston (6) , C. Aulbert (7) , S. Babak (7) , S. Ballmer (8) , B. C. Barish (1) , C. Barker (9) , D. Barker (9) , B. Barr (10) , P. Barriga (11) , M. A. Barton (1) .... |
| Description: |
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 Omega(GW) x [H(0)/72 km s(-1) Mpc(-1))](2) < 6.5 x 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. |