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Prélude à l'analyse des données du détecteur Virgo: De l'étalonnage à la recherche de coalescences binaires

Abstract : The Virgo detector for gravitational waves is at present in its commissioning phase, which precedes the search for astrophysical sources, for which it is intended. The work described in this thesis focuses on the preparation of data analysis methods, and their application on data sets taken along the detector's progression. These methods are thus described as well as their validation and the results obtained on the data.

The first part of this analysis relates to the detector response to gravitational waves. The calibration procedure consists in measuring this response, from which the detector sensitivity at all frequencies is obtained; this procedure has allowed to follow the evolution of Virgo over the last two years. It is followed by the gravitational signal reconstruction, a process that compensates for the effects of this response on the data and subtracts certain noises.

The second part is dedicated to the search for coalescing binaries signals in the reconstructed data. The studied method is an alternative implementation – the multi-band template analysis - of the optimal method, the latter being limited by computing costs issues. The equivalence of this alternative implementation with the usual method is checked, thanks to simulation tests. The method is then applied to the two most recent data taking, with the double goal of getting prepared for future astrophysical searches, and of evaluating the current detector. The preparation of the future collaborative analysis with LIGO experiment is finally considered, through a first quantitative comparison of the two experiments analysis pipelines for the search for coalescing binaries.
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Contributor : Fabrice Beauville <>
Submitted on : Monday, September 26, 2005 - 7:21:09 PM
Last modification on : Friday, November 6, 2020 - 3:26:49 AM
Long-term archiving on: : Friday, April 2, 2010 - 10:14:06 PM


  • HAL Id : tel-00010297, version 1



Fabrice Beauville. Prélude à l'analyse des données du détecteur Virgo: De l'étalonnage à la recherche de coalescences binaires. Astrophysique [astro-ph]. Université de Savoie, 2005. Français. ⟨tel-00010297⟩



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