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

Kazuharu Bamba | Zendy; M. Yoshimura | Zendy

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

Author(s) -

Kazuharu Bamba,

M. Yoshimura

Publication year - 2006

Publication title -

progress of theoretical physics

Language(s) - English

Resource type - Journals

eISSN - 1347-4081

pISSN - 0033-068X

DOI - 10.1143/ptp.115.269

Subject(s) - physics , curvature , cmb cold spot , scalar (mathematics) , scalar field , amplitude , theoretical physics , coupling (piping) , quadratic equation , invariant (physics) , realization (probability) , classical mechanics , mathematical physics , quantum mechanics , cosmic microwave background , mathematics , geometry , anisotropy , mechanical engineering , statistics , engineering

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

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