Comptes Rendus
no. 10
Cosmic inflation and model comparison
[Quel est le meilleur modèle d'inflation ?]
Vincent Vennin1  ; Jérôme Martin2 ; Christophe Ringeval3
1 Institute of Cosmology & Gravitation, University of Portsmouth, Dennis Sciama Building, Burnaby Road, Portsmouth, PO1 3FX, United Kingdom
2 Institut d'astrophysique de Paris, UMR 7095-CNRS, Université Pierre-et-Marie-Curie, 98 bis, boulevard Arago, 75014 Paris, France
3 Centre for Cosmology, Particle Physics and Phenomenology, Institute of Mathematics and Physics, Louvain University, 2, chemin du cyclotron, B-1348 Louvain-la-Neuve, Belgium
Comptes Rendus. Physique, Volume 16 (2015) no. 10, pp. 960-968.

Nous discutons les implications pour l'inflation des données récemment obtenues par le satellite Planck. Nous expliquons pourquoi les scenarios à un champ scalaire et terme cinétique standard, dans le régime de roulement lent, sont favorisés. À l'intérieur de cette classe de modèles, nous montrons comment l'approche bayésienne peut être utilisée pour identifier les scénarios les plus plausibles et contraindre la fin de l'inflation et la phase de réchauffement. Nous concluons en discutant comment de futures missions spatiales nous permettrons d'améliorer notre connaissance de l'inflation.

We analyze the implications for inflation of the recently released Planck Cosmic Microwave Background data and explain why the single-field slow-roll scenarios with minimal kinetic terms are favored. Within this class of models, we show how Bayesian model comparison can be used to further exclude about one third of the inflationary scenarios. We also study the end of inflation and show that Planck can already constrain the reheating phase. Finally, we conclude by discussing how future missions will be able to improve our knowledge of the inflationary mechanism.

Publié le :
DOI : 10.1016/j.crhy.2015.07.007
Keywords: Cosmology, Inflation, Model Comparison
Mot clés : Cosmologie, Inflation, Comparaison des modèles
Vincent Vennin 1 ; Jérôme Martin 2 ; Christophe Ringeval 3

1 Institute of Cosmology & Gravitation, University of Portsmouth, Dennis Sciama Building, Burnaby Road, Portsmouth, PO1 3FX, United Kingdom
2 Institut d'astrophysique de Paris, UMR 7095-CNRS, Université Pierre-et-Marie-Curie, 98 bis, boulevard Arago, 75014 Paris, France
3 Centre for Cosmology, Particle Physics and Phenomenology, Institute of Mathematics and Physics, Louvain University, 2, chemin du cyclotron, B-1348 Louvain-la-Neuve, Belgium 
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Vincent Vennin; Jérôme Martin; Christophe Ringeval. Cosmic inflation and model comparison. Comptes Rendus. Physique, Volume 16 (2015) no. 10, pp. 960-968. doi : 10.1016/j.crhy.2015.07.007. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2015.07.007/

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