Reconstruction et caractérisation des polarisations d'une onde gravitationnelle

Abstract : Polarization properties of gravitational waves carry crucial information about the physics of gravitational sources (binary compact systems of black holes or neutron stars, etc.) such as precession effects. In practice, the reconstruction of the two polarizations h+(t) and h×(t) is made possible by the use of at least two non-aligned detectors. To this aim, we propose a complete analysis procedure of gravitational signals. Starting from measurements, this procedure estimates the sky position of the source, reconstructs the two components h+(t) and h×(t) and estimates instantaneous Stokes parameters of the wave. This set of non-parametric observables encodes many fine properties of the astrophysical source without close bounds to a specific dynamical model, making them particularly suited to decipher precession effects.
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Fangchen Feng, Julien Flamant, Pierre Chainais, Eric Chassande-Mottin, Nicolas Le Bihan. Reconstruction et caractérisation des polarisations d'une onde gravitationnelle. XXVIIeme Colloque GRETSI, Aug 2019, Lille, France. ⟨hal-02410728⟩

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