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Etude numérique de l'époque de réionisation avec le code de simulation EMMA

Abstract : The epoch of reionization (EoR) is a phase of big changes in the first billion years of the Universe history. After the apparition of the first stars and the emission of energetic radiation by thoses ones, the hydrogen was reionized. This transition has an impact on the galaxies formations. I was part of the development team of EMMA, a numerical simulation code who aimed to study the processes happening during the EoR. I developed and implement a stellar formation and evolution model. These works contributed to the realisation of one of the biggest simulation dedicated to the study of the EoR yet. I contribute to the development of a tool dedicated to the exploration of this kind of simulations. I study how the radiation escaped the galaxies as a function of the parameters of the stellar model, and showed that supernovae could increase the ratio of escaping photon. I also studied the ionization fronts propagation and showed that the speed of light could be reduced by a factor 3 (and then divide the computational cost of the radiative transfer by 3), while keeping corrects results .
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Submitted on : Friday, June 22, 2018 - 4:26:52 AM
Last modification on : Friday, April 5, 2019 - 8:16:14 PM
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  • HAL Id : tel-01820659, version 1



Nicolas Deparis. Etude numérique de l'époque de réionisation avec le code de simulation EMMA. Astrophysique [astro-ph]. Université de Strasbourg, 2017. Français. ⟨NNT : 2017STRAE047⟩. ⟨tel-01820659⟩



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