LIGO Document P1000128-v26

Upper limits on a stochastic gravitational wave background using LIGO and Virgo interferometers at 600-1000 Hz

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11 Jan 2012, 12:06
A stochastic background of gravitational waves is expected to arise from a superposition of many incoherent
sources of gravitational waves, of either cosmological or astrophysical origin.
This background is a target for the current generation of ground-based
detectors. In this article we present the first joint search for a stochastic
background using data from the LIGO and Virgo interferometers.
In a frequency band of 600-1000 Hz, we obtained a \( 95\% \) upper limit on the
amplitude of
\( \Omega_{\rm GW}(f) = \Omega_3 \left( f/900 \mathrm{Hz}\right)^3 \), of
\( \Omega_3 0.33 \),
assuming a value of the Hubble parameter of
\( h_{100}=0.72 \). These new limits are a factor of
seven better than the previous best in this frequency band.
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Extra edits to a) update author list and b) fix some typos found after the paper was accepted
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