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Comptes Rendus Physique
Volume 4, n° 8
pages 953-959 (octobre 2003)
Doi : 10.1016/j.crhy.2003.09.004
Isocurvature cosmological perturbations and the CMB

David  Langlois
Institut d'astrophysique de Paris, 98bis, boulevard Arago, 75014 Paris, France 

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We present a short review on cosmological isocurvature perturbations, which some early universe models predict in addition to the standard adiabatic perturbation. After defining the isocurvature perturbations, we analyse their evolution within the framework of the standard perturbation theory. We then explain how these perturbations can be constrained by the CMB data. We finally discuss some mechanisms that generate isocurvature perturbations. To cite this article: D. Langlois, C. R. Physique 4 (2003).

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Nous donnons une introduction aux perturbations cosmologiques isocourbures, qui sont prédites par certains modèles de cosmologie primordiale, en plus des perturbations adiabatiques habituelles. Après avoir défini la notion de perturbations isocourbures, nous analysons leur évolution dans le cadre de la théorie standard des perturbations cosmologiques. Nous expliquons ensuite comment ces perturbations peuvent être contraintes par les observations du CMB. Finalement, nous présentons quelques mécanismes qui engendrent des perturbations isocourbures. Pour citer cet article : D. Langlois, C. R. Physique 4 (2003).

Mots clés  : Cosmic Microwave Background anisotropies ; Cosmology ; Early Universe.

Mots clés  : Anisotropies du fond de rayonnement cosmique ; Cosmologie ; Univers primordial.




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