Curvaton Scenario in the Presence of Two Dilatons Coupled to the Scalar Curvature

Details Curvaton Scenario in the Presence of Two Dilatons Coupled to the Scalar Curvature Curvaton Scenario in the Presence of Two Dilatons Coupled to the Scalar Curvature

2006-01-06

arxiv.org/abs/hep-ph/0601047v2

Prog.Theor.Phys. 115 (2006) 269-308

Physics

High Energy Physics

High Energy Physics - Phenomenology

45 pages, 5 figures, typos corrected

Scientific paper

10.1143/PTP.115.269

The possibility of the realization of a curvaton scenario is studied in a theory in which two dilatons are introduced along with coupling to the scalar curvature. It is shown that when the two dilatons have an approximate O(2) symmetric coupling, a scalar field playing the role of the curvaton may exist in the framework of this theory without introducing any other scalar field for the curvaton. Thus the curvaton scenario can be realized, and in the simple version of the curvaton scenario, in which the curvaton potential is quadratic, the curvature perturbation with a sufficient amplitude and a nearly scale-invariant spectrum suggested by observations obtained from WMAP can be generated.

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