Transport de neutrinos dans les supernovas gravitationnelles

Abstract : This thesis is about numerical simulations of core collapse supernovae, with an accent on the neutrino transport problem. Neutrinos play a central role in the explosion mechanism. Their numerical implementation is difficult, because of the very detailed knowledge needed to treat their interactions, and because of the very big demand in computational power. The first part of the thesis is on the physical contect of core collapse supernovae. Then, I introduce the numerical methods used, with an accent on the ones of the code I used all along my PhD, the CoCoNuT code. The third part of the thesis is about a drastic simplification of the neutrino treatment, namely the leakage scheme. Then, I use this scheme to study black hole formation, where I show the influence of additional particles (pions and hyperons) on black hole formation. Another proposed way of dealing with the neutrinos is with the resolution of the Boltzmann equation in general relativity. The derivation of this equation is done in the fourth part of the thesis. Then, the fifth part introduces a new numerical code to solve it. I show the numerical methods used, and tests, to show that the code works well.
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Bruno Peres. Transport de neutrinos dans les supernovas gravitationnelles. Astrophysique stellaire et solaire [astro-ph.SR]. Observatoire de Paris, 2013. Français. ⟨tel-00943896⟩

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