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Curvaton and QCD axion in supersymmetric theories

Chun, Eung Jin and Dimopoulos, Konstantinos and Lyth, David H. (2004) Curvaton and QCD axion in supersymmetric theories. Physical Review D, 70 (10). ISSN 1550-7998

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Abstract

A pseudo-Nambu-Goldstone boson as curvaton avoids the η problem of inflation which plagues most curvaton candidates. We point out that a concrete realization of the curvaton mechanism with a pseudo-Nambu-Goldstone boson can be found in the supersymmetric Peccei-Quinn mechanism resolving the strong CP problem. In the flaton models of Peccei-Quinn symmetry breaking, the angular degree of freedom associated with the QCD axion can naturally be a flat direction during inflation and provides successful curvature perturbations. In this scheme, the preferred values of the axion scale and the Hubble parameter during inflation turn out to be about 1010 and 1012 GeV, respectively. Moreover, it is found that a significant isocurvature component, (anti)correlated to the overall curvature perturbation, can be generated, which is a smoking gun for the curvaton scenario. Finally, non-Gaussianity in the perturbation spectrum at a potentially observable level is also possible.

Item Type: Article
Journal or Publication Title: Physical Review D
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 23002
Deposited By: Dr Konstantinos Dimopoulos
Deposited On: 19 Jan 2009 10:58
Refereed?: Yes
Published?: Published
Last Modified: 21 Oct 2014 11:32
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/23002

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