The University of Southampton
University of Southampton Institutional Repository

Preheating curvature perturbations with a coupled curvaton

Bastero-Gil, M., Di Clemente, V. and King, S.F. (2004) Preheating curvature perturbations with a coupled curvaton Physical Review D, 70, (2), 023501-[16pp]. (doi:10.1103/PhysRevD.70.023501).

Record type: Article


We discuss the potentially important role played by preheating in certain variants of the curvaton mechanism in which isocurvature perturbations of a D-flat (and F-flat) direction become converted to curvature perturbations during reheating. We analyze the transition from inflation to reheating in some detail, including the dynamics of the coupled curvaton and inflation fields during this transition. We discover that preheating could be an important source of adiabaticity where the parametric resonance of the isocurvature components amplifies the superhorizon fluctuations by a significant amount. As an example of these effects we develop a particle physics motivated model which we recently introduced in which the D-flat direction is identified with the usual Higgs field. Our new results show that it is possible to achieve the correct curvature perturbations for initial values of the curvaton fields of the order of the weak scale. In this model we show that the prediction for the spectral index of the final curvature perturbation only depends on the mass of the curvaton during inflation, where consistency with current observational data requires the ratio of this mass to the Hubble constant to be <~0.3.

Full text not available from this repository.

More information

Published date: 8 July 2004


Local EPrints ID: 57038
ISSN: 1550-7998
PURE UUID: 1beaca7b-50e0-4cef-aa53-1c0ce57543f4

Catalogue record

Date deposited: 13 Aug 2008
Last modified: 17 Jul 2017 14:29

Export record



Author: M. Bastero-Gil
Author: V. Di Clemente
Author: S.F. King

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton:

ePrints Soton supports OAI 2.0 with a base URL of

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.