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Pierre, Mathias
Universite Paris-Saclay, Espace Technologique, Immeuble Discovery, Route de l'Orme aux Merisiers RD 128, 91190 Saint-Aubin (France); Universite Paris-Sud, Ecole doctorale no. 576 - Particules Hadrons Energie et Noyau, Instrumentation, Image, Cosmos et Simulation, Laboratoire de Physique Theorique d'Orsay (France)2018
Universite Paris-Saclay, Espace Technologique, Immeuble Discovery, Route de l'Orme aux Merisiers RD 128, 91190 Saint-Aubin (France); Universite Paris-Sud, Ecole doctorale no. 576 - Particules Hadrons Energie et Noyau, Instrumentation, Image, Cosmos et Simulation, Laboratoire de Physique Theorique d'Orsay (France)2018
AbstractAbstract
[en] One of the most puzzling problems of modern physics is the identification of the nature a non-relativistic matter component present in the universe, contributing to more than 25% of the total energy budget, known as Dark Matter. Weakly Interacting Massive Particles (WIMPs) are among the best motivated dark matter candidates. However, in light of non conclusive detection signals and strong constraints from collider, direct and indirect detection experiments, this thesis presents constraints on several realizations of the WIMP paradigm in the context of simplified dark matter models. More elaborated models considering extended gauge structures are discussed further on, such as constructions involving generalized Chern-Simons couplings and a specific WIMP scenario motivated by some recently observed flavor anomalies related to the RK(*) observable. The second part of this thesis is devoted to the discussion of an alternative dark matter thermal production mechanism where an explicit realization of the Strongly Interacting Massive Particles (SIMPs) paradigm is discussed in the context of a non-Abelian hidden gauge structure. In a last part, the possibility of producing non-thermally a dark matter component via the 'freeze-in' mechanism was investigated and the strong impact of the post-inflationary reheating stage of the universe on such constructions illustrated by the specific case where dark matter density production is mediated by a heavy spin-2 field in addition to the standard graviton. (author)
[fr]
Un des problemes les plus intrigants de la physique moderne est l'identification de la nature d'une composante de matiere non-relativiste presente dans l'univers, contribuant a plus de 25% de sa densite d'energie totale, appelee matiere noire. Les particules 'WIMPs' (Weakly Interacting Massive Particles) sont parmi les categories de candidats a la matiere noire les plus consideres. Cependant, en l'absence de resultats concluants d'experiences de detection directe, indirecte et aupres de collisionneurs de particules, la premiere partie de cette these est devouee a l'etude du paradigme 'WIMP' dans le contexte de modeles simplifies. Des modeles considerant des extensions de jauge sont etudiees par la suite tels que des theories presentant des couplages de Chern-Simons ainsi qu'un modele motive par l'observation recente d'anomalies dans le domaine de la physique la saveur lie a l'observable RK(*). La deuxieme partie de cette these est devouee a l'etude de mecanismes alternatifs de production thermique de matiere noire en particulier en considerant une realisation specifique du mecanisme 'SIMP' (Strongly Interacting Massives Particles) dans le contexte d'une symetrie de jauge non-abelienne cachee. Dans une derniere parNONLUMINOUS MATTER; WIMPSNONLUMINOUS MATTER; WIMPS; COSMOLOGY; BOLTZMANN EQUATION; HIGGS BOSONS; Z NEUTRAL BOSONS; GAUGE INVARIANCEtie, la possibilite de produire une composante de matiere noire de maniere non-thermique a travers le mecanisme 'freeze-in' est etudiee. En particulier, le fort impact de l'epoque post-in ationnaire de l'univers sur la production de densite de matiere noire est illustre par l'etude d'un modele de matiere noire mediee par un champ de spin 2 massif en plus du graviton standard. (auteur)Original Title
Phenomenologie de la matiere noire: etude de modeles WIMPs et solutions alternatives
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25 Sep 2018; 275 p; 533 refs.; Available from the INIS Liaison Officer for France, see the INIS website for current contact and E-mail addresses; These de doctorat de l'Universite Paris-Saclay, Specialite: Physique des particules
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