Neutrinos et Cosmologie dans les modèles de Grande Unification : Détection de matière noire supersymétrique, Oscillations et Leptogénèse dans SO(10)

Abstract : The problems of dark matter and baryonic asymmetry in cosmology are tackled. In the MSSM framework, the neutralino is the best candidate to cold dark matter. Prospection for neutralino indirect detection by neutrino telescopes like Antares is performed in Grand Unification models including a comparison with direct detection capabilities. In those models, neutrinos fluxes coming from neutralino annihilation at the centre of the Earth are beyond reach of neutrino telescopes. In the universal case, models with a dominant neutralino higgsino fraction are very promising for detection of fluxes coming from the Sun. Relaxing universality in the gaugino sector, especially decreasing M3_GUT gives wider cosmologically interesting regions than the universal case and detection rates several orders of magnitude higher. Leptogenesis by heavy right-handed Majorana neutrino decays is thought to be a good way to achieve baryonic asymmetry. By the see-saw mecanism, those right-handed neutrinos are also the nicest mean to account for neutrinos masses. We have fixed neutrino Dirac sector to up-quark ones by simple Grand Unification group SO(10) inspired relations. We then have pointed out the importance of the less experimentally constrained parameter Ue3 to maximise the resulting asymmetry. Despite this fine tuning, this model is not able to reconcile neutrino oscillation experimental data and the value of the baryonic asymmetry required by Big-Bang nucleosynthesis.
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Submitted on : Friday, March 28, 2003 - 1:41:41 PM
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Emmanuel Nezri. Neutrinos et Cosmologie dans les modèles de Grande Unification : Détection de matière noire supersymétrique, Oscillations et Leptogénèse dans SO(10). Astrophysique [astro-ph]. Université Blaise Pascal - Clermont-Ferrand II, 2002. Français. ⟨tel-00002641⟩

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