PHYSICAL REVIEW D, v. 85, NO 12, Page. 122001-122014
Abstract
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
Ω
GW
(
f
)
=
Ω
3
(
f
/
900
Hz
)
3
, of
Ω
3
<
0.32
, assuming a value of the Hubble parameter of
h
100
=
0.71
. These new limits are a factor of seven better than the previous best in this frequency band.