Article,
A cross-correlation technique in wavelet domain for detection of stochastic gravitational waves
(2005)
Abstract
tochastic gravitational waves (SGW) can be detected by measuring a cross-correlation of
two or more gravitational wave (GW) detectors. In this paper we describe an optimal SGW
search technique in the wavelet domain. It uses a sign correlation test, which allows
calculation of the cross-correlation significance for
non-
Gaussian data
. We also address the
problem of
correlated noise
for the GW detectors. A method that allows calculation of the
cross-correlation variance
, when data is affected by correlated noise, is developed. As a part
of the optimal search technique a robust estimator for detector noise spectral amplitude is
introduced. It is not sensitive to outliers and allows application of the search technique to
non-stationary data.
