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Analysis of first LIGO science data for stochastic gravitational waves.
Physical Review D, 69
Art. No. 122004.
- Published Version
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We present the analysis of between 50 and 100 h of coincident interferometric strain data used to search for and establish an upper limit on a stochastic background of gravitational radiation. These data come from the first LIGO science run, during which all three LIGO interferometers were operated over a 2-week period spanning August and September of 2002. The method of cross correlating the outputs of two interferometers is used for analysis. We describe in detail practical signal processing issues that arise when working with real data, and we establish an observational upper limit on a f^-3 power spectrum of gravitational waves. Our 90% confidence limit is Ω0h100(^2)<~23±4.6 in the frequency band 40–314 Hz, where h100 is the Hubble constant in units of 100 km/sec/Mpc and Ω0 is the gravitational wave energy density per logarithmic frequency interval in units of the closure density. This limit is approximately 104 times better than the previous, broadband direct limit using interferometric detectors, and nearly 3 times better than the best narrow-band bar detector limit. As LIGO and other worldwide detectors improve in sensitivity and attain their design goals, the analysis procedures described here should lead to stochastic background sensitivity levels of astrophysical interest.
|Additional Information:||© 2004 American Physical Society.
Received 14 January 2004; published 30 June 2004.
The authors gratefully acknowledge the support of the United States National Science Foundation for the construction and operation of the LIGO Laboratory and the Particle Physics and Astronomy Research Council of the United Kingdom, the Max-Planck-Society and the State of Niedersachsen/Germany for support of the construction and operation of the GEO600 detector. The authors also gratefully acknowledge the support of the research by these agencies and by the Australian Research Council, the Natural Sciences and Engineering Research Council of Canada, the Council of Scientific and Industrial Research of India, the Department of Science and Technology of India, the Spanish Ministerio de Ciencia y Tecnologia, the John Simon Guggenheim Foundation, the David and Lucile Packard Foundation, the Research Corporation, and the Alfred P. Sloan Foundation. This paper has been assigned LIGO Document Number LIGO-P030009-H-Z.
|Funding Agency||Grant Number|
|National Science Foundation||UNSPECIFIED|
|Particle Physics and Astronomy Research Council (PPARC)||UNSPECIFIED|
|State of Niedersachsen (Germany)||UNSPECIFIED|
|Australian Research Council||UNSPECIFIED|
|Natural Sciences and Engineering Research Council of Canada (NSERC)||UNSPECIFIED|
|Council of Scientific and Industrial Research of India||UNSPECIFIED|
|Department of Science and Technology of India||UNSPECIFIED|
|Ministerio de Educación y Ciencia||UNSPECIFIED|
|John Simon Guggenheimn Foundation||UNSPECIFIED|
|David and Lucile Packard Foundation||UNSPECIFIED|
|Alfred P. Sloan Foundation||UNSPECIFIED|
|Subject Keywords:||gravitational wave detectors; gravitational waves; light interferometry; stochastic processes |
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|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited On:||14 Jan 2009 18:46|
|Last Modified:||25 Feb 2014 22:56|
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