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Signature de divers modèles d'univers primordial dans les anisotropies du rayonnement fossile

Abstract : This PhD thesis is devoted to the study of several primordial Universe scenarios and their imprint on the Cosmic Microwave Background (CMB) anisotropies. In the first part, the cosmological perturbation evolution equations are derived. The physics of the CMB is explained, as well as its dependence on the cosmological parameters. The next three parts tackle several primordial Universe scenarios. Part two presents active seeds scenarios, among which are topological defects. The major differences with inflationary scenarios are presented. The importance of non linear effects in the seeds evolution as well as non gravitational interactions with the rest of the Universe are explained. Part three is about inflationary scenarios and discusses the standard hypotheses that are usually made about the state of the cosmological perturbations at the end of inflation. We stress the importance of a correct parameterization of the perturbations in order to extract some accurate information about the cosmological parameters from the CMB anisotropies observations. Finally, part four presents some work about quintessence scenarios, especially the influence of the quintessence field on the cosmological perturbations. It is shown that the predictions made from these scenarios are quite different from scenarios with a cosmological constant.
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Contributor : Alain Riazuelo <>
Submitted on : Saturday, September 13, 2003 - 12:15:10 AM
Last modification on : Wednesday, September 23, 2020 - 4:38:56 AM
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  • HAL Id : tel-00003366, version 1




Alain Riazuelo. Signature de divers modèles d'univers primordial dans les anisotropies du rayonnement fossile. Cosmologie et astrophysique extra-galactique [astro-ph.CO]. Université Paris Sud - Paris XI, 2000. Français. ⟨tel-00003366⟩



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