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Des horloges atomiques à la mission MICROSCOPE : recherche de violations d’invariance de Lorentz

Abstract : This thesis presents two Lorentz invariance tests, performed within the Standard Model Extension framework (SME). The first one is a search for a violation in the matter sector of the SME, using data from a cold atom clock. The search for variations in the hyperfine transition frequency of 133Cs allowed us to constrain several SME coefficients related to protons and neutrons, with a sensitivity improving by up to 12 orders of magnitude the current best laboratory limits on these coefficients. The second test was carried out using the data from the MICROSCOPE space mission, in flight since April 2016, which is intended to test the Weak Equivalence Principle (WEP) with an accuracy of 10−15 on the Eötvös parameter. In this experiment, a coupling between matter and gravitation could lead to Lorentz violation signals and therefore to variations in relative acceleration of two test masses depending on the satellite orientation. The relative acceleration is measured by a differential electrostatic accelerometer. The first results, obtained through the analysis of five sessions, have already demonstrated an improvement of up to 4 orders of magnitude of the constraints on two coefficients of the SME sector of matter-gravity couplings.
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Hélène Pihan-Le Bars. Des horloges atomiques à la mission MICROSCOPE : recherche de violations d’invariance de Lorentz. Astrophysique [astro-ph]. Université Paris sciences et lettres, 2018. Français. ⟨NNT : 2018PSLEO010⟩. ⟨tel-02109290⟩

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