Isocurvature cosmological perturbations and the CMB

David Langlois

doi:10.1016/j.crhy.2003.09.004

Isocurvature cosmological perturbations and the CMB
[Perturbations cosmologiques isocourbures et le CMB]

Présenté par : Guy Laval

David Langlois ¹

¹ Institut d'astrophysique de Paris, 98bis, boulevard Arago, 75014 Paris, France

Comptes Rendus. Physique, the cosmic microwave background, Volume 4 (2003) no. 8, pp. 953-959.

Résumé
Abstract

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.

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.

Publié le : 2003-10-01

DOI : 10.1016/j.crhy.2003.09.004

Keywords: Cosmic Microwave Background anisotropies, Cosmology, Early Universe
Mots-clés : Anisotropies du fond de rayonnement cosmique, Cosmologie, Univers primordial

Affiliations des auteurs :

David Langlois ¹

¹ Institut d'astrophysique de Paris, 98bis, boulevard Arago, 75014 Paris, France

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David Langlois. Isocurvature cosmological perturbations and the CMB. Comptes Rendus. Physique, the cosmic microwave background, Volume 4 (2003) no. 8, pp. 953-959. doi : 10.1016/j.crhy.2003.09.004. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2003.09.004/

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