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The possibility of the realization of a curvaton scenario is studied in atheory in which two dilatons are introduced along with coupling to the scalarcurvature. 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 existin the framework of this theory without introducing any other scalar field forthe curvaton. Thus the curvaton scenario can be realized, and in the simpleversion of the curvaton scenario, in which the curvaton potential is quadratic,the curvature perturbation with a sufficient amplitude and a nearlyscale-invariant spectrum suggested by observations obtained from WMAP can begenerated.Comment: 45 pages, 5 figures, typos correcte

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