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Theses

De l'étalonnage d'Advanced Virgo à la recherche d'ondes gravitationnelles émises par des coalescences de binaires compactes

Abstract : The era of gravitational astronomy began with the first detection of a gravitational wave on September 14, 2015, by the LIGO-Virgo collaboration. The first detections come from coalescences of black holes with masses of a few tens of solar masses. The European detector Advanced Virgo restarted in 2017 to participate in the next detections of gravitational waves and to locate the astrophysical sources.This thesis deals with the different stages of the gravitational waves detection process: from the calibration of the Advanced Virgo detector to low-latency analysis of the LIGO-Virgo interferometer network data. First, the objectives, method and results of the detector calibration are described. This step is crucial for understanding the sensitivity of the detector and for reconstructing the amplitude of the gravitational wave. A new algorithm, SilenteC, developed during the thesis is then detailed: its objective is to identify the sources of non-stationary noises that limit the sensitivity of the analysis. Some transient noises are non-linear and SilenteC tries to identify this type of contribution. Finally, low-latency MBTA analysis for the detection of gravitational wave signals from compact binary coalescences is described. In particular, emphasis is put on the study of vetos making it possible to distinguish the astrophysical signals to be selected and the transient noises to be rejected as efficiently as possible.
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Vincent Germain. De l'étalonnage d'Advanced Virgo à la recherche d'ondes gravitationnelles émises par des coalescences de binaires compactes. Cosmologie et astrophysique extra-galactique [astro-ph.CO]. Université Grenoble Alpes, 2017. Français. ⟨NNT : 2017GREAY101⟩. ⟨tel-02120852⟩

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