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Theses

Contraintes expérimentales sur des modèles avec champ scalaire léger dans le secteur sombre en cosmologie et physique des particules

Abstract : This PhD thesis presents constraints on the parameters of a cosmological model, the galileon model, and a particle physics model, the branon model. Both are extensions of the standard models that include an additional scalar field and that can be built from extra dimensions theories. The galileon model propose an alternative to the cosmological constant as the nature of dark energy, and the branon model give a dark matter particle candidate. The first part of this thesis shows the predictions of the galileon model and the results obtained from their comparison with recent cosmological and astrophysical observations. The set of observations used contains the cosmic microwave background, cosmological distances measurements and the detection of gravitational waves along with their electromagnetic counterpart from the merger of a binary star system. The study shows that the galileon model has serious difficulties to reproduce these observations. The second part describe the search for branons in proton-proton collisions data at 13 TeV collected in 2016 with the Compact Muon Solenoid at the Large Hadron Collider. Events with high energy jets, produced by a quark, a gluon or a vector boson decaying hadronically, and missing transverse energy in the final state are selected and compared to background estimations. No excess of event has been found allowing for experimental constraints to be put in the parameter space of the branon model.
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https://tel.archives-ouvertes.fr/tel-01920518
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Submitted on : Tuesday, November 13, 2018 - 12:13:09 PM
Last modification on : Friday, May 29, 2020 - 4:01:50 AM
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  • HAL Id : tel-01920518, version 1

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Clément Leloup. Contraintes expérimentales sur des modèles avec champ scalaire léger dans le secteur sombre en cosmologie et physique des particules. Cosmologie et astrophysique extra-galactique [astro-ph.CO]. Université Paris-Saclay, 2018. Français. ⟨NNT : 2018SACLS303⟩. ⟨tel-01920518⟩

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