LIGO Document P1000128-v20

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

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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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Notes and Changes:
Corrections to author list (M. Frei and K. Yamamoto)
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