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Comptes Rendus Physique
Volume 4, n° 8
pages 833-839 (octobre 2003)
Doi : 10.1016/j.crhy.2003.10.010
CMB: the isotropic part

François R.  Bouchet a * ,  Jean-Loup  Puget b
aInstitut d'astrophysique de Paris, CNRS, 98 bis Bd Arago, Paris, 75014, France 
bInstitut d'astrophysique spatiale, Université Paris XI, 91405 Orsay, France 

*Corresponding author.
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The Cosmic Microwave Background, or CMB, is the only truly diffuse background, whereas the other backgrounds come from the integrated light (along the line of sight) of various sources. The CMB is now known, thanks to the FIRAS experiment above the COBE satellite, to have a nearly perfect blackbody spectrum. This proves to be quite constraining on early energy releases. We review the average spectrum of the CMB with respect to other backgrounds and the consequences regarding the history of the early Universe. To cite this article: F.R. Bouchet, J.-L. Puget, C. R. Physique 4 (2003).

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Le rayonnement fossile à 3K (CMB) est l'un des rares fonds extragalactiques de nature diffuse alors que la majorité des autres fonds provient de la lumière intégrée (le long de la ligne de visée) de sources variées. Le CMB est maintenant connu, grâce à l'expérience FIRAS à bord du satellite COBE, comme possédant un spectre indistinguable de celui d'un corps noir. Cela apporte de fortes contraintes sur des évenements énergétiques précoces. Nous présentons le spectre moyen du CMB par rapport aux autres fonds de rayonnement et les conséquences quant à l'histoire de l'Univers primordial. Pour citer cet article : F.R. Bouchet, J.-L. Puget, 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.




© 2003  Published by Elsevier Masson SAS de la part de Académie des sciences.

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