The spectral index and its running in axionic curvaton

研究成果: Article査読

18 被引用数 (Scopus)

抄録

We show that a sizable running spectral index suggested by the recent SPT data can be explained in the axionic curvaton model with a potential that consists of two sinusoidal contributions of different height and period. We find that the running spectral index is generically given by dns/d ln k ∼ 2π/ΔN (ns - 1)) where ΔN is the e-folds during one period of modulations. In the string axiverse, axions naturally acquire a mass from multiple contributions, and one of the axions may be responsible for the density perturbations with a sizable running spectral index via the curvaton mechanism. We note that the axionic curvaton model with modulations can also accommodate the red-tilted spectrum with a negligible running, without relying on large-field inflation.

本文言語English
論文番号013
ジャーナルJournal of Cosmology and Astroparticle Physics
2013
6
DOI
出版ステータスPublished - 2013 6月

ASJC Scopus subject areas

  • 天文学と天体物理学

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