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Theses

Wavelet graphs for the detection of gravitational waves : application to eccentric binary black holes

Abstract : In december 2015 the LIGO detectors have first detected a gravitational wave emitted by a pair of coalescing black holes 1.3 billion years ago. Many more observations have been realised since then and heralded gravitational waves as a new messenger in astronomy. The latest detection is the merge of two neutron stars whose electromagnetic counterpart has been followed up by many observatories around the globe. These direct observations have been made possible by the developpement of advanced data analysis techniques. With them the weak gravitational wave inprint in detectors may be recovered. The realised work during this thesis aims at developping an existing gravitational wave detection method which relies on minimal assumptions of the targeted signal. It more precisely consists in introducing an information on the signal phase depending on the astrophysical context. The first part is dedicated to a presentation of the method. The second one presents the results obtained when applying the method to the search of stellar mass binary black holes in simulated Gaussian noise data. The study is repeated in real instrumental data collected during the first run of LIGO. Finally, the third part presents the method applied in the search for eccentric binary black holes. Their orbit exhibits a deviation from the quasi-circular orbit case considered so far and thus complicates the signal morphology. This third analysis establishes first results with the proposed method in the case of a poorly modeled signal
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Submitted on : Thursday, October 31, 2019 - 3:16:13 PM
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  • HAL Id : tel-02341759, version 1

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Philippe Bacon. Wavelet graphs for the detection of gravitational waves : application to eccentric binary black holes. Astrophysics [astro-ph]. Université Sorbonne Paris Cité, 2018. English. ⟨NNT : 2018USPCC113⟩. ⟨tel-02341759⟩

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