Hilltop inflation with preinflation from coupling to matter fields

Antusch, Stefan and Nolde, David and Orani, Stefano. (2014) Hilltop inflation with preinflation from coupling to matter fields. Journal of Cosmology and Astroparticle Physics (JCAP), 1405. 034.

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Official URL: http://edoc.unibas.ch/39803/

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We propose a class of models of supersymmetric hilltop inflation (also called "new inflation") where the initial conditions of the inflaton close to the hilltop are generated through "matter field preinflation". This is achieved via a coupling term between the inflaton and matter fields (i.e. Standard Model fields or a right-handed neutrino). The same coupling also opens up a decay channel for the inflaton into Standard Model fields, which allows efficient reheating of the universe. We discuss the multifield dynamics of the inflaton and matter fields during inflation using the delta N formalism and show under which conditions the model effectively reduces to single-field hilltop inflation during the last 60 e-folds. We also study perturbative reheating through the matter-inflaton coupling for a specific example where the matter field is identified with a right-handed (s)neutrino, and demonstrate that in this case the model can generate the observed baryon asymmetry through nonthermal leptogenesis.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik (Antusch)
UniBasel Contributors:Antusch, Stefan and Nolde, David Maik and Orani, Stefano
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:IOP Publishing
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:30 Jun 2016 11:00
Deposited On:02 May 2016 09:25

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