Structure formation in warm dark matter cosmologies

Diplôme Thèse Structure formation in warm dark matter cosmologies eng 2015-09-02 author Paduroiu Sinziana 683926 director Pfenniger Daniel 26497 10.13097/archive-ouverte/unige:87494 urn:nbn:ch:unige-874944 Sc. 4933 The nature of dark matter constitutes one of the biggest questions in physics, cosmology and astronomy. This thesis explores dark matter hypothesized models, with a focus on warm dark matter models, from both theoretical and numerical simulations perspectives, with the purpose of constraining the dark matter particle candidates. Using high-resolution simulations I have studied the effect of warm dark matter properties on large-scale structure - structure formation and evolution and small-scale structure – internal properties of dark matter halos. The results show that structure formation is qualitatively different from the cold dark matter scenario and more complex than originally assumed – a hybrid between top-down and bottom-up mechanisms. Moreover, warm dark matter halos contain visible caustic and shells with shallower density profiles, depending on the free streaming length of the particles. Predictions that can be tested by observations are given. Technical aspects of warm dark matter simulations are being discussed as well. Astrophysics Cosmology Particle physics Dark matter Warm dark matter Structure formation Galaxies Sterile neutrinos Dewey 520 26 Département d'astronomie 12 false 77a7b6a9-e2f3-4a59-82c2-646fdf1cdda1 Thesis Public thesisSP.pdf 6809137 application/pdf Private 2017-09-14 3aad266fd9eaf8e887c3e3f38ba1d6e5404613cdac2131da36d9486ac933cc15 openAccess Faculté des sciences / Département d'astronomie

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Paduroiu, Sinziana