Curvaton and QCD Axion in Supersymmetric Theories

Details Curvaton and QCD Axion in Supersymmetric Theories Curvaton and QCD Axion in Supersymmetric Theories

2004-02-05

arxiv.org/abs/hep-ph/0402059v2

Phys.Rev. D70 (2004) 103510

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 18 pages, 3 figures, published version. Phys. Rev. D (in press)

Scientific paper

10.1103/PhysRevD.70.103510

A pseudo Nambu-Goldstone boson as curvaton avoids the eta-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 10^{10} GeV and 10^{12} 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 potentially observable level is also possible.

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