Parametric resonance after hilltop inflation caused by an inhomogeneous inflaton field

Antusch, Stefan and Cefala, Francesco and Nolde, David and Orani, Stefano. (2016) Parametric resonance after hilltop inflation caused by an inhomogeneous inflaton field. Journal of Cosmology and Astroparticle Physics (JCAP), 1602 (02). 044.

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We study preheating after hilltop inflation where the inflaton couples to another scalar field, e.g. a right-handed sneutrino, which provides a mechanism for generating the correct initial conditions for inflation and also a decay channel for the inflaton that allows for reheating and non-thermal leptogenesis. In the presence of such a coupling, we find that after the phases of tachyonic preheating and tachyonic oscillations, during which the inflaton field becomes inhomogeneous, there can be a subsequent preheating phase where the fluctuations of the other field get resonantly enhanced, from initial vacuum fluctuations up to amplitudes of the same order (and even larger) as the ones of the inflaton field. This resonant enhancement differs from the usual parametric resonance as the inflaton field is inhomogeneous at the time the enhancement takes place. We study this effect using lattice simulations as well as semi-analytically with a generalized Floquet analysis for inhomogeneous background fields.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik (Antusch)
UniBasel Contributors:Antusch, Stefan and CefalĂ , Francesco 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
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Last Modified:13 Feb 2017 13:18
Deposited On:13 Feb 2017 13:18

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