Deciphering the mechanisms at play in the formation and evolution of the large-scale structure of the universe is part of the scientific goals of many projects of observational cosmology. In particular, large-scale structure observations can be used to infer mode-coupling effects, whether they come from the physics of the early universe or from its late time evolution. Specificities of such couplings are presented, noting that in principle they can be directly detected through bispectra of the cosmic microwave background temperature anisotropies or density in the local universe. The existence of such couplings have however more far-reaching consequences for the growth of the structure. Those are sketched as well as their possible observational impacts.
La compréhension fine des mécanismes en jeu au cours de la formation des structures à grande échelle de l'univers est l'un des objectifs scientifiques communs à de nombreux projets de cosmologie observationnelle. Les observations des grandes structures permettent de révéler les effets des couplages de modes, qu'ils soient associés à des processus physiques dans l'univers primordial ou à l'évolution plus tardive de ces structures. Les propriétés de ces couplages sont décrites, en soulignant qu'en principe ils peuvent être directement détectés grâce au bispectre des anisotropies de température du fond diffus cosmologique ou du champ de densité dans l'univers local. L'existence de tels couplages a toutefois des conséquences plus profondes pour la croissance des structures. Celles-ci sont esquissées, ainsi que leurs possibles implications observationnelles.
Mots-clés : Cosmologie, Gravitation, Structure à grande échelle, Couplages non linéaires
Francis Bernardeau 1, 2
@article{CRPHYS_2015__16_10_986_0,
author = {Francis Bernardeau},
title = {Non-linear couplings, from the early to the late time universe},
journal = {Comptes Rendus. Physique},
pages = {986--993},
publisher = {Elsevier},
volume = {16},
number = {10},
year = {2015},
doi = {10.1016/j.crhy.2015.08.004},
language = {en},
}
Francis Bernardeau. Non-linear couplings, from the early to the late time universe. Comptes Rendus. Physique, Cosmic inflation / Inflation cosmique, Volume 16 (2015) no. 10, pp. 986-993. doi : 10.1016/j.crhy.2015.08.004. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2015.08.004/
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