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Preheating curvature perturbations with a coupled curvaton

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.

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Citation

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).

More information

Published date: 8 July 2004

Identifiers

Local EPrints ID: 57038
URI: http://eprints.soton.ac.uk/id/eprint/57038
ISSN: 1550-7998
PURE UUID: 1beaca7b-50e0-4cef-aa53-1c0ce57543f4

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

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Contributors

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

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